My Aero AR-10 in 308 is experiencing some pierced primers, with factory ammo, not handloads. MAGTECH 308 168gr HPBT.
I did check the headspace with GO, NO-GO gauges at assembly and it checked out good. It's got an Aero NIB bolt, and using wire-size drills as gauges, the firing pin hole checks out at 0.081", and the tip of the firing pin is about .0780". It's killed 1 firing pin already. Is it the ammo? "thin primer cup"?
I examined the tip of the replacement firing pin, and it's got a nice radius to it, still smooth, but I already had another pierced primer with the replacement FP. The primer is still in the brass, it's just got a hole in it.
Also have a Geissele HS-NM trigger in it. 24" Brownells/Satern barrel. I didn't have this occur at all when I was shooting M80 ball ammo.
I noticed that in comparison, my Aero nitride 308 BCG has the high-pressure version firing pin & bolt, I think that's what it's called, nominal .070" aperture, .067" firing pin tip. Wondering if I should switch out the bolt to this HP version. I would like my firing pin to last more than 1 box of ammo.
I did check the headspace with GO, NO-GO gauges at assembly and it checked out good. It's got an Aero NIB bolt, and using wire-size drills as gauges, the firing pin hole checks out at 0.081", and the tip of the firing pin is about .0780". It's killed 1 firing pin already. Is it the ammo? "thin primer cup"?
I examined the tip of the replacement firing pin, and it's got a nice radius to it, still smooth, but I already had another pierced primer with the replacement FP. The primer is still in the brass, it's just got a hole in it.
Also have a Geissele HS-NM trigger in it. 24" Brownells/Satern barrel. I didn't have this occur at all when I was shooting M80 ball ammo.
I noticed that in comparison, my Aero nitride 308 BCG has the high-pressure version firing pin & bolt, I think that's what it's called, nominal .070" aperture, .067" firing pin tip. Wondering if I should switch out the bolt to this HP version. I would like my firing pin to last more than 1 box of ammo.