06-21-2012, 07:44 PM
Any pics of the separated case heads?
Could be that the larger powder volume is substantial enough to cause the combustion flow to spike through the gas system, and rip the case head off due to too early unlocking and extraction.
This would explain why you're not seeing issues with the factory ammo at tame load volumes.
What buffer weight are you using, and what type of bolt carrier do you have?
If carbine-length stock, look into a heavier buffer, like an H2 or H3.
Could be that the larger powder volume is substantial enough to cause the combustion flow to spike through the gas system, and rip the case head off due to too early unlocking and extraction.
This would explain why you're not seeing issues with the factory ammo at tame load volumes.
What buffer weight are you using, and what type of bolt carrier do you have?
If carbine-length stock, look into a heavier buffer, like an H2 or H3.