by bangbangping Sat Dec 14, 2013 4:30 pm, Post 0. Plenty of nice loads available for many components. <> Technical Specifications (based on the respective safety standard - see more details in tab "Datasheet" if available) Subscribe to the free newsletter and do not miss any news or promotions. Ramshot Enforcer is a high-performance, double-base spherical propellant intended for high-power handgun revolver cartridges, such as .44 Magnum, .454 Casull, or .500 Magnum. 9.0, 10.0 grains Hodgdon H-110 powder (See chronograph data below) 2.230 COL (2.260 is max for AR-15) Use load data at your own risk. and 5.56 NATO loads. The best 5 shot group was .334 MOA while the worst was 3.787 MOA! An ideal solution for loading 357 Magnum, 44 Magnum, and even 410-bore shotshell ammunition, its high loading density provides optimal velocity. The 300 AAC Blackout is a similar concept to previous wildcats, such as the 30-221 and 300 Fireball, as well as the proprietary 300 Whisper, except that 300 BLK was the first to be a SAAMI approved cartridge and any company is free to make firearms or ammunition. Old Craftsman 6-inch dial calipers passed on the author by his machinist father alongside a Wilson .300 Blackout case gauge. All .300 Blackout rifles can shoot either subsonic or supersonic with no additional changes or accessories, the only difference being in the ammunition. Most quiet but not functional (w/o lighter springing): The targets above represent the loads shown in the table. In addition, H110 is "the" choice for 410-bore shotgun, especially among . A .300 Blackout rifle loaded with subsonic ammunition and fitted with a suppressor is truly silenced; the firearms loudest element is the bolt going home with every shot. Tipped MatchKing (TMK) REVIEW with IMR 4064, Remington Model Seven (Model 7) Versus The Model 700, Reloading for the Ruger Precision Rifle (RPR) 6.5 Creedmoor, Vang Comp Systems Ghost Ring Sight Installation, DVD Review: Bill Rogers Reactive Pistol Shooting, 223 Remington Load Development: 52, 55, 69 HPBT, Varget and the Ruger American Rifle, Tuffy Security Products Heavy Duty Truck Bed Security Drawer Review, Remington 870 Tritium Rifle Sight Installation, USMC M40A5 Build- Part 1: Gathering the Parts, Re-chambering a barrel: 243 Winchester to 647 Lapua. We continue to prioritize our shipments to our traditional sales channels to maximize powder availability at retailers. * All prices incl. W296 is also viable for reloading .300 Blackout, although it is best suited for supersonic loads only. If, you are wanting to use 4198 for driving a .223, then that is a different story. It has since become popular for a wide range of uses including hunting and home defense. subsonic 300blk. Rounds were fed from a AICS style 223 magazine from Accurate Mag. I explained to him he wouldnt really have a 300 BLK anymore. At this point, I will say, Im not a fan of plastic calipers, as the material involved is just too prone to damage, and Ive always been skeptical of their accuracy. 0. Why not give JD Jones credit for the development of the 300 Whisper, which AAC tweaked into the 300 AAC Blackout by increasing the length of the chamber throat 0.015 and SAAMI-ed it. Since my post back in Jan 2019, I have switched and lil Gun cut the groups in half.Sub sonic. The .300 Blackout is an intermediate rifle cartridge, just like 5.56mm NATO and 7.62x39mm. However, the 300 Blackouts heavier bullet compensates for its lesser speed to grant it an effective muzzle energy, and its 0.84 greater diameter enables it to inflict a wider wound channel. While the powder formulas are identical, the chrono testing is likely from different production lots. Click here to download Sierra Bullets 300 AAC Blackout Load Data for the 5th Edition Manual. powder coated cast bullet made with NOE bullet mold TL310-225-RN, lead hardness at 24bhn, sized to 0.310". Berry's 220 grain 300 Blackout bullets. 296 speaks for itself. Rifle Data Rifle Data Here you will find load data for some of the most recent cartridges on the market, with more being added each week. A balance-beam scale used for measuring powder charges. 1 pound. IMR propellants have long been used to manufacture US military service ammunition, such as .30-06 M2 Ball (IMR 4895) or 7.62mm NATO M61 AP (IMR 4475). They are only safe in the rifle shown and may not be safe in yours. 28:21. By cross referencing the group size shown on the target with the group size in the table, you can determine which group was shot by which load. Find load data for Shooters World Blackout propellant by clicking the button "Loads for this Powder".More about this powder:ShootersWorld: Ballistic results for this propellant show it appropriate for both pistol and rifle cartridges that incorporate a near straight-walled cartridge case. Example 220gr subsonic data there for h4198 and reloader 7 two thingsfirst not in anyway subsonicthey are high velocity. I have complete faith in my Lord. Using bullets from Barnes TSX FB, Hornady V-Max, Sierra Hollow Point, Nosler Ballistic Tip, Sierra Spitzer SP, Barnes TSX BT, Sierra MatchKing HPBT, Hornady MonoFlex, Hornady GMX, Speer Grand Slam, Speer Mag-Tip, Sierra Palma HPBT, Hornady SST, Hornady A-Max. I went back and read my notes. Although they are more recently developed cartridges, lots of people love lil' gun in 460 Magnum and in the rifle cartridges 300 Blackout and 450 Bushmaster. Bullets for the .300 Blackout are where things can also get interesting. I have seen a few complaints from people with barrels under 10, but better stability was found when switching to a 1-7 twist rate. I use a Dillon Precision XL650 and Ive been happy with it.Once you have your press, youre going to need appropriate dies. Communism only made one thing that works, and capitalism can make it even better. Available in 1 lb., 4 lb. Most of the reloading manuals show lower data, I suspect this is related to the wide variety of ways to form brass for the cartridge and how that may cause an increase in pressures. With the right projectiles and an adequate rifle platform, such loads are ideal for hunting or self-defense. %PDF-1.5 The 300 AAC Blackout (300 BLK, or 7.62x35mm) was created by Advanced Armament Corp. and Remington in order to provide the military with a way to shoot .30 caliber bullets from the M4 platform with only a barrel change. With the right load and A LOT of tuning, the rifle shot well with both supersonic and sub sonic offerings. Always start [] 243 Outdoors. Once you reuse your brass, your ammunition costs will decrease even more. It tends to be the most accurate powder in those two rifles cartridges. Just sayn, I switched to LilGun for 220RN sub groups we t down to under 1 MOA cycles 26 bbl great. As far as twist rate is concerned,I wanted the flexibility of being able to shoot the light and heavy rounds, so I ordered a custom barrel from Bartlein with a 1:7 twist. At worst, it puts you at risk of extreme and life-threatening overpressure. In fact hide all tools you value from such people.At some point in the .300-Blackout reloading process, youre going to need to be able to weigh your powder charges. Both the 296 and Lil'Gun loads functioned but my ears told me the 296 was the loudest of the two. Whether you are reloading to save money or to create the perfect load for hunting, self-defense, or suppressed use, there is load data and a suitable propellant for you. Alliant Power Pro 300-MP Lake City Federal 205 17.1 1866 19.2 Winchester 296 Lake City Federal 205 16.7 1894 18.4 Ramshot Enforcer Lake City Federal 205 15.4 1839 17.2 IMR 4227 Lake City Federal 205 16.7 1823 18.5 C Accurate 5744 Lake City Federal 205 17.5 1829 18.7 C Vihtavuori N110 Lake City Federal 205 15.0 1830 16.5 C If you are using heavily soiled range-pickup brass, youll need the more aggressive walnut-hull media.All in all, youll have some upfront costs but if you shoot a lot of .300 Blackout, youll find the break even point in short order. A carbine length gas system (one comment mentioned 16.5 inch gun would not cycle the action) will not work with subsonic loads in 300 blackout. Winchester - Legendary Powders RELOADING DATA CENTER ALL THE LOAD DATA YOU'LL EVER NEED ALL IN ONE PLACE! Want a subsonic load using reloader 7 or h4198? Cycles better than anything. There are offerings from Sierra with one of the notables being their 220-grain MatchKing. An innovative way to carry your backup gun. : 1,867 2,110 Press. It is the factory powder for Winchester 357, 41 and 44 magnums. JP silent spring, 1 1/2 MOA . Comprehensive load data for Winchester 296 reloading powder und technical specifications for this propellant. This can lead to poor accuracy from lighter loads. The following are loads that Lehigh Defense recommends for the 194gr ME bullet. This cartridge accepts 0.308 bullets, making it a true .30-caliber cartridge for which a wide selection of projectiles ranging from 80 to 250 grains is available. My TSAR 11.5 upper is flawless so far. Anecdotal accounts from other shooters indicated this would provide the best accuracy with the 220 grain Sierra MatchKing (SMK). Hodgdon CFE-BLK was designed to provide that level of consistency and performance in the .300 AAC Blackout cartridge, particularly when making subsonic loads. Most accurate and functional: 10.0gr AA1680, WSPM @ 2.180 OAL - 1,025 fps. The case gauge is to be used to check every loaded piece of ammunition. 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Subscribe to the free newsletter and do not miss any news or promotions. AAC 7.62 Suppressor , Crimp is most important as heavy bullets want to move on recoil in the mag and will cause vertical stringing. Hodgdon produced the load data below using a 16 barrel with a 1:8 twist rate, Hornady cases with a trim length of 1.363, and Remington 7 1/2 Small Rifle Magnum primers. Links to published Data added. I think 296 and 4227 are the same powders, not 100% sure though. I haven't had much luck with Trail Boss in the Blackout for what it's worth. Reviews can only be submitted while being logged in. The Fora platform includes forum software by XenForo. A handloader using .300 Blackout has less case capacity to experiment with than they would with a full-power rifle cartridge such as .308 Winchester or .30-06 Springfield. H110 is the spherical powder that screams "no wimps, please!", delivering top velocities with great accuracy in 44 Magnum, 454 Casull, 475 Linebaugh and the 460 and 500 S&W magnums. There is not much load data for this powder so I had to work up my own. Instability with 1:8 caused problems with loger cans, bullet maybe wobbling after rifling. Winchester 296 is a ball powder developed for large handgun loads. February 15, 2022. Hodgdon H110 is identical to Winchester 296; it is simply sold under a different label. An Instruction/Load data Sheet for the 300 Blackout die set can be purchased through the link below. 6.5 Creedmoor load development: Sierra 130 grain Tipped MatchKing (TMK) with H4350, Varget, Reloder 15 and Reloader 17, First impressions ofthe Modular Driven Technologies (MDT) HS3 Chassis system. The chief difficulty in accurately firing 300 Blackout comes from learning to accommodate its pronounced bullet drop. Consult appropriate load manuals prior to developing your own handloads. 448 54 However, it is listed in the 2017 and later printings. The two key features that make the 300 BLK excellent for the AR platform, make it difficult to work with in a bolt action rifle; a short case and use of both super and subsonic bullets. Winchester 296 Recipe Source: ALL Alliant Powder Hodgdon Shooters World VihtaVuori Starting Max Source 85 gr RN (Sierra) 0.308" Powder: H110 (Hodgdon) Primer: CCI 400 Case: WIN Trim Length: 1.285" C.O.L. 300 AAC Blackout is also finding use with hunters, who may not have been able to legally hunt with .223 in their state, and who prefer .30 caliber bullets for medium-sized game. Note: In the target above, the groups labeled 6.5 123 were shot with a 6.5 Creedmoor and are not relevant to this post. Digital calipers are typically cheaper than equivalent-quality dial calipers. The low case capacity requires the use of powders with a fast burn rate like H110 and IMR 4227. Create a free website or blog at WordPress.com. This website uses cookies to ensure the best experience possible. Load Data Card - .300 AAC Blackout (7.62x35mm) - AR-15. It is a versatile chambering, capable of accepting a wide range of .30-caliber projectiles. Although all Ramshot propellants are made in Belgium at the PB Clermont factory, it is a Hodgdon brand, benefitting from the companys decades of experience in smokeless powder manufacturing. Advanced Armament Corporation began developing a .30 caliber subsonic cartridge optimized for the M4 platform in 2009. To save a bunch of questions, you may want to add W296 next to H110, with a note that they are the same powder. Available in 1 lb., 4 lb. Winchester continued to refine firearm designs with inventors Benjamin Tyler Henry and Nelson King, and on May 22,1866 the Winchester Repeating Arms Company was born. Also slight keyholing and groups growing up. No over pressure signs were evident in the cases or primers . The 2017 printing is identified by the gold star on the front cover that states "Revised 2017 New Powders over 37,000 loads". Joined Feb 16, 2018 Messages 439. Hogdon H110 isn't bad according to Foghorn (who graciously loaned . 180 grain rainier wedges cycled with 11ish grains of IMR4198 out of my PSA 10.5in suppressed with Syrac Ordinance adjustable gas block. x}% 9 V/@]Jz$Y-l7 m1#`2A2*tTfn2+O~W|S/_^Se=~oL/Ooh}k4m{zc{>{!w-77cz-Nnxo#j~_~t{pt/c|~z'Gc;2`gk)i,0 1cOh||z>3z L`];H\Gwyb^z-_.oWlw}E> Match Grade. Today, IMR is a trademark of the IMR Powder Company, a Hodgdon brand. BTW, small standard rifle primers are nearly identical to small magnum pistol primers .. about the same mix and cup thickness. 1020FPS with last round bolt hold open There are a handful of solid reloading manuals out there from Speer, Hornady, Sierra, and Barnes, to name a few. It doesnt have to be fast or super accurate, just looking for a cheap plinking round, Lil gun will work for you. Born in Boston in 1810, Winchesters initial foray into business was as a maker of mens shirts. 12 drop at 150 yd. Caution is warranted here. 3 0 obj An ideal solution for loading 357 Magnum, 44 Magnum, and even 410-bore shotshell ammunition, its high loading density provides optimal velocity. This is the best group achieved with the 300 BLK and 135 SMK at 100 yards. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. Other companies, such as Hornady, also have a variety of projectiles available ranging from light to heavy weight for the caliber. by crs7861 Sun Dec 15, 2013 12:25 am, Powered by phpBB Forum Software phpBB Limited. All CFE powders are double-base, spherical propellants designed to perform 2 tasks: For example, CFE-223 is optimized for .223 Remington, CFE Pistol is best suited for commonly-used pistol cartridges (9x19mm, .45 ACP) CFE-BLK is designed for .300 Blackout. The rifle, as pictured above, includes the following parts fromBrownells: For testing and evaluation purposes, I used 125, 135, 175 and 220 grain Sierra MatchKings (left to right in photo below) over H110 and IMR 4227 powders. These are powders that are typically marketed to the magnum pistol crowd, not the rifle folks. works like a charm. However, the .300 Blackout is available in both supersonic and subsonic loads, while the . Sign up to get updates and access to exclusive promotions. Hodgdon's load data for H4189, H110, Lil-Gun powders (not that I'm using those powders) with A-Max 208's actually lists 2.26" as the OAL which is the max SAAMI spec. Restrictions placed on us by the powder manufacturers do not allow us to email any load data. Ordered 1:7 barrel to another gun, used same loads in exactly same conditions, no issues. 1 0 obj Quick Load program is, buy their own admission should NEVER be used over ANY published data. 300 BLK - Powder Coated Bullets with Winchester 296 6,475 views Mar 9, 2017 166 Dislike Share Save Johnny's Reloading Bench 120K subscribers Testing some powder coated bullets with Winchester. If you wish to run the 235gr Lee supersonic it will be fine but subsonic you should choose a different powder. Firearm: 8.5 CMMG Barrel, H3 heavy buffer, superlative arms adjustable gas block, 30 Cal Kinetic Suppressor. I know, how about the virtues of a bow or crossbow? Winchester 296 is also recommended for 410-bore AA loads. Whereas the fixed distance competition shooter may be fine with higher magnification and precise .125 MOA adjustments, the military/law enforcement/tactical shooter is []. I found some commercial manufactures (mostly off the record) either discontinued bolt guns in 300 BLK, pulled them from the market after the product was announced, or declined to introduce them due to accuracy and feeding concerns. % The 300 AAC Blackout (300 BLK) is a popular alternativecartridgein the AR-15/M16 M4 (AR) community. H 4831, 220 gr RN Fed 205 heavy factory crimp, 1050 fps cycles my 16 M4. Winchester 296 is also recommended for 410-bore AA loads. Take your pick. More about this powder: Winchester 296 is a ball powder developed for large handgun loads. Suggested subsonic load: R-P 300 AAC BLACKOUT brass Remington 7.5 primers 11.2 grains of AA 1680 powder Case length is 1.368 +0.000 -0.020 Sierra 220 MK loaded to 2.089 OAL (this length is optimal for reliable feeding from USGI magazines) . 300 AAC BLACKOUT (Subsonic Loads) Barrel: 16" Twist: 1-10" Primer: WIN WSR Bullet Diameter: 0.308" Case: REM Max Case Length: 1.368" Trim Length: 1.358" Accurate 1680 Bullet weight: 230 grains. Ive read people just up the charge of 1680 but it doesnt seem that great and want to keep that for my subs. The 300 bulk is an underpowered cartridge-on par with theM1 carbine of WWII- but not as easy to wield. I have firearms in all three and I know some will disagree but for me, I would never use lil' gun in anything! If you are planning to reuse your brass, and you should, you will probably want to clean it. endobj Why not put all pomp aside and manufacture light bullets for this PISTOL? 7.3 grains of trail boss seems high even for max charge. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. The 2017 printing is identified by the gold star on the front cover that states "Revised 2017 New Powders over 37,000 loads". Click "Get Data" to view results. You MUST have a pistol length gas system. In my Palmetto State Armory 7.5 upper the load functions perfectly ! Again, if youre using .300 Blackout ammo in a gas-operated, semi-automatic rifle, youll have less flexibility in powder, since the gun needs enough gas to cycle reliably. Hogdon H110 works well for 110-220gr projectiles. Using 125 gr prohunter, I really appreciate the updated data, I was working on subsonic loads and Sierra did the work for me. Ballistically speaking, the 7.62x39 mm (center) is similar to the .300 Blackout (l.) and .30-30 Win. Size -- Quantity You might think I carry a gun because I don't trust God. 300 Blackout 220 GR SIE HPBT Winchester 296 .308" 2.260" . Eventually, they got their own 300 Blackout cartridge SAAMI approved in 2011. .300 AAC Blackout - Manufacturer Loading Data Shellholder: Hornady #16 Lee #4 Lyman #26 RCBS #10 Pistol Rifle Cowboy Starting Max Source 100 gr HPCE / OTCE (Lapua) 0.308" Powder: N105 (VihtaVuori) Primer: Small Rifle Case: Lapua Trim Length: 1.362" C.O.L. I know some may say to check every fifth, or tenth, or whatever number cartridge. (r.). So Remington will be budget-priced UMC-brand 300 BLK ammo through at just $12.99 per box that's less than most other rifle cartridges than are more powerful than the .223. This powder generates relatively high velocities, making it suitable for loading hunting or self-defense ammunition. 10 Best Handguns for Beginners and Home Defense, The Best Concealed Carry Holsters in 2022, Best Shotgun Mini Shells: Birdshot, Buckshot & Slugs, 8 Best AR-15 Ammo for Self Defense & Range, 5 Best Places to Buy Cheap 50 Cal BMG Ammo Online, 17.4-grain charge Muzzle velocity: 1,885 ft/s Muzzle energy: 1,025 ft-lbf Chamber pressure: 38,700 psi, 19.4-grain charge (compressed) Muzzle velocity: 2,062 ft/s Muzzle energy: 1,227 ft-lbf Chamber pressure: 49,000 psi, 15.6-grain charge Muzzle velocity: 1683 ft/s Muzzle energy: 943 ft-lbf Chamber pressure: 34,500 psi, 17.8-grain charge Muzzle velocity: 1,899 ft/s Muzzle energy: 1,201 ft-lbf Chamber pressure: 48,700 psi, 10.4-grain charge (compressed) Muzzle velocity: 1,056 ft/s Muzzle energy: 470 ft-lbf Chamber pressure: 29,100 psi, 10.1-grain charge Muzzle velocity: 1,044 ft/s Muzzle energy: 532 ft-lbf Chamber pressure: 26,700 psi, 19.0-grain charge Muzzle velocity: 1,866 ft/s Muzzle energy: 967 ft-lbf Chamber pressure: 23,700 psi, 20.0-grain charge (compressed) Muzzle velocity: 1,945 ft/s Muzzle energy: 1,050 ft-lbf Chamber pressure: 26,500 psi, 19.0-grain charge Muzzle velocity: 1,895 ft/s Muzzle energy: 1,077 ft-lbf Chamber pressure: 24,600 psi, 22.5-grain charge (compressed) Muzzle velocity: 2,090 ft/s Muzzle energy: 1,310 ft-lbf Chamber pressure: 37,000 psi, 11.6-grain charge (compressed) Muzzle velocity: 1,041 ft/s Muzzle energy: 501 ft-lbf Chamber pressure: 13,400 psi, 11.3-grain charge (compressed) Muzzle velocity: 1,045 ft/s Muzzle energy: 558 ft-lbf Chamber pressure: 20,000 psi, 19.5-grain charge Muzzle velocity: 1,877 ft/s Muzzle energy: 1,174 ft-lbf, 21.7-grain charge Muzzle velocity: 2,057 ft/s Muzzle energy: 1,410 ft-lbf Chamber pressure: 54,564 psi, 10.9-grain charge Muzzle velocity: 1,089 ft/s Muzzle energy: 553 ft-lbf, 18.4-grain charge Muzzle velocity: 2,191 ft/s Muzzle energy: 1,173 ft-lbf Chamber pressure: 38,900 psi, 21.7-grain charge Muzzle velocity: 2,286 ft/s Muzzle energy: 1,277 ft-lbf Chamber pressure: 48,400 psi, 15.7-grain charge Muzzle velocity: 1,921 ft/s Muzzle energy: 1,024 ft-lbf Chamber pressure: 32,400 psi, 18.5-grain charge (compressed) Muzzle velocity: 2,205 ft/s Muzzle energy: 1,350 ft-lbf Chamber pressure: 52,500 psi, 17.4-grain charge Muzzle velocity: 2,182 ft/s Muzzle energy: 1,163 ft-lbf, 19.3-grain charge Muzzle velocity: 2,362 ft/s Muzzle energy: 1,363 ft-lbf Chamber pressure: 54,472 psi, 17.5-grain charge Muzzle velocity: 2,182 ft/s Muzzle energy: 1,322 ft-lbf, 19.4-grain charge Muzzle velocity: 2,358 ft/s Muzzle energy: 1,544 ft-lbf Chamber pressure: 54,293 psi, Reducing copper fouling in the barrel even after high volumes of fire. Get free updates when we add new tips, articles and more! $ 39.99. These dimensions make caliber conversions of firearms from 5.56/.223 to .300 Blackout relatively easy, only needing a barrel replacement. Every product is hand selected by our editors. Most have reported it will not work for pistol systems either) H110 (subs and supers, however may not function some carbine systems with subs. Certifiable has done some pretty good work on Subsonic powders for both carbine and pistol gas systems. When it comes to recoil energy, assuming you're using an 8 pound rifle, the Blackout hits you less with 4.3 foot-pounds compared to the AK's 6.34 foot-pounds. They are a lot more economical for plinking than spending the money on the Sierras. Supersonic loads allow you to use lighter bullets and reach higher muzzle velocities. It set the standard. Copyright: All Rights Reserved Available Formats Download as PDF, TXT or read online from Scribd Flag for inappropriate content Let your fellow shooters know share this article using the Facebook, Twitter and other social media icons below. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); If you guys had bothered to ask people what powder they would like to see lil gun would definitely be on that list. As mentioned, it should NOT be reduced. An ideal solution for loading 357 Magnum, 44 Magnum, and even 410-bore shotshell ammunition, its high loading density provides optimal velocity. These seemingly small differences are significant. 220 g round nose / 9.9 g H110 cycles 8.5 and 16 barrels no issues. The 300 Blackout's .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains quadruple the weight of the typical 223 Rem round's. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. 125 gr. If you're unsure, or just want options, check as many boxes as you'd like. . or 5.56 NATO chamber. We place limited powder inventory for sale on a regular basis on our website. Find load data for Winchester 296 propellant by clicking the button "Loads for this Powder". Ultimate Reloader is not responsible for errors in load data on this website. Yea, that's right. The 300 BLK is an interesting cartridge for the rifleman. Punching it into quickload shows a 64% case fill, and pressures estimated in the 22K range. The 300 Blackouts .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains quadruple the weight of the typical 223 Rem rounds. Very versatile. Since I wasnt trying to build a wildcat 300-221, which is what a modified 300 BLK would effectively be, I went with a standard chamber cut by a Manson Reamer. Known for its ability to deliver heavy subsonic bullets for standard AR magazines while cycling the action in suppressed applications, it also works well with lighter supersonic loads, offering a similarexternal ballistic performance to the 7.62x39mm Russian (check out my 300 AAC Blackout Review from September 2012). Powders include Winchester, Hodgdon, IMR containers. Serving as optimal powders for their intended cartridges. Start load: 9.9 grains (ca 975 Fps). If you arent worried about being on the cutting edge of accuracy, the fast twist needed to stabilize the heavier bullets, means you are spinning the lighter loads way too fast. Not only does this allow for compatibility with existing magazines and bolts, but it allows reloaders to form their own brass from cut-down 5.56mm or .223 cases ensuring brass supply even in the event of a shortage of factory brass. I like my custom 300 BLK. Prior to building a custom bolt action rifle in 300 BLK I did a lot of homework on loads and load development. The fast burn rate makes it ideal for use in subsonic loads, producing enough pressure to cycle the action even when pushing the heaviest bullets out of the muzzle. The cartridge shares case-head dimensions and body taper with the .223 Remington.
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