Quoted:
I've evern measured these to make sure that my headspace is smaller than the chamber.
M.L.
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What did you use to measure this? You mentioned you have a Stoney Point, correct? If you used the SP, what are the following three measurements:
1. Headspace of a fired cases?
2. Headspace of a re-sized case?
3. Headspace of the XM193 that works fine?
A chamber gauge is simply not accurate enough to measure these differences.
How far do you feel is required to bump the shoulder for a AR, to ensure 100 function?
Don't take this personally, we are just trying to help. In most cases when this comes up, it is ultimately determined to be loader error, not that of the mfg. If any production ammo works, it is typically a loading problem. I have seen several dies that are just a tad long in the body, therefore not allowing the case far enough up into the die to move the shoulder far enough. The die, in that case, just need a tad ground off the bottom.
BTW - I am in NW Houston also. You should join us out at ASC for our next match - end of April. There are about 10 of us getting together on a regular basis, and would love to have even more join. Just watch in the Texas forum as we always start a thread the week before.