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Old January 26, 2020, 10:34 AM   #265
mehavey
Senior Member
 
Join Date: June 17, 2010
Location: Virginia
Posts: 5,581
The cartridge ain't the problem... no more/no less than any of the AR straightwalls like the 450 BushMstr or the 50 BeoWooof.

Somehow we're getting the critical Bolt-to-Chamberwall-Start dimension wrong in the builds, and it's getting rolled into the much simpler term/overall cartridge length "headspace"




With all the 556 ARs being built -- operating at that same pressure/with that same critical distance -- it ought to be a no-brainer. But again, I don't know how to measure it.
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