Pro tip: Don’t use the wrong caliber ammo
5 Responses to “Pro tip: Don’t use the wrong caliber ammo”
Remember, I do this to entertain me, not you.
Uncle Pays the Bills
 |
|
Find Local
|
Categories
- ATF (769)
- Death Match (10)
- Eminent Domain (225)
- In the bag (9)
- Notes to Junior (546)
- Poker (74)
- Recipes (142)
- Shotgun Noob (11)
- The Airing of Grievances (19)
- uncategorized (47,725)
January 14th, 2015 at 5:14 pm
Current first comment there:
“300blk will NOT normally chamber in a .223/5.56 chamber. What happens is that if you have a loose projectile, or a non-crimped projectile, when you chamber .300BLK in a .223/5.56 is that the bullet gets pushed back into the cartridge case enough to seat the cartridge.”
January 14th, 2015 at 6:31 pm
Having tested this myself, I’ve never seen a case where a full velocity AR-15 BCG failed to cause sufficient bullet setback on a 300BLK cartridge to successfully close the bolt. Crimping is irrelevant. It may be possible to load 300BLK with a compressed charge such that it won’t chamber, but I have never seen it (and won’t try it). Assume that 300BLK will KB a 223.
Always verify your ammo. Many cartridge/chamber combinations exhibit this behavior. (308 in 270 etc)
Be careful. Testing should be performed with dummy cartridges and spent primers.
January 15th, 2015 at 1:56 am
Perhaps the manufacturers of .300 BLK brass should take a cue from the .460 Rowland. Make the Brass longer so even if the bullet is loose it still will not chamber.
In fact the question should be why the hell am I even having to make this observation!!! This should have been a done deal and its not even a hindsight is 20/20 because it has been used before to keep this very thing from happening.
January 15th, 2015 at 9:16 am
Paul,
Which case dimension are you talking about, the shoulder or the neck? Neither would impact a 5.56 chamber before bullet setback. The case neck, if sufficiently lengthened, would impact the 5.56 chamber shoulder and crimp in front of the bullet.
I don’t think the laws of .460 Rowland Physics apply here. The only thing that would work is blowing out the case a few mils, sacrificing magazine compatibility and or capacity.
January 15th, 2015 at 11:45 am
Neither the Neck nor the shoulder should be lengthened. The area between the Shoulder and base should be lengthened and the bullet recessed. Capacity and pressure should remain the same. Crimp location would change.
The idea is to use the shoulder as the stop and prevent the bolt from locking up. The AR mag can handle longer brass than is standard for a .223 or .300BLK.