Loading 5.56 for short barrel

[Rumbler]

That 4500 fps 55gr load what pressure is that at

I do not have a proofing setup. But with a published maximum pressure for the 5.56 NATO cartridge at 62,366 psi, I'd say it is a safe bet I am probably there plus a little because I use a heavy barrel (as opposed to a standard "military" barrel.

I know that you know the 5.56 NATO cartridge will often flatten the crap out of the primers. My load only occasionally flattens a primer and I believe that is because I use exclusively once fired NATO brass and some primers seat more firmly than others.