BCL 18.6” AR Barrels, who wants them?

300 blackout was designed to burn all of it's powder in a 9-10" barrel. I think at 18.5" you'd start to lose performance. Personally I think the 300 blackout really only makes sense in a short barrel, suppressed carbine shooting subsonic ammo. Highly effective for CQB/CQC applications.
 
300 blackout was designed to burn all of it's powder in a 9-10" barrel. I think at 18.5" you'd start to lose performance. Personally I think the 300 blackout really only makes sense in a short barrel, suppressed carbine shooting subsonic ammo. Highly effective for CQB/CQC applications.

My nr - 30 carbine (18.6 barrel)runs on the same powder as my 300 blk which has 16 inch barrel. Both rifles run fine on the H110 or 296 as well as A-1680. I also have a 300 blk sbr which will run fine on D4198 and or the pistol powders. Can't see why the 300 wouldn't be ok in 18.6 inch. Use a flat base bullet for max loading
 
My nr - 30 carbine (18.6 barrel)runs on the same powder as my 300 blk which has 16 inch barrel. Both rifles run fine on the H110 or 296 as well as A-1680. I also have a 300 blk sbr which will run fine on D4198 and or the pistol powders. Can't see why the 300 wouldn't be ok in 18.6 inch. Use a flat base bullet for max loading

I have a 16" RARR Compact. Works just fine with the loadings I use in 7.5" or 12.5" AR's. Velocity is still gained, just not leaps and bounds anymore.
300BO to me makes sense in a NR barrel length because then I can use an AR type platform for hunting small to medium game in tight bush.
This whole 300 is only good because it can be run with suppressors and subsonic is regurgitated BS. Supersonic loads are great if you handload it opens a very broad range of projectile options.
The cartridge offers fairly significant increases in energy and hole size compared to 223 with minimal changes required to the platform.
 
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