6.5 grendel pin hole through primers

[Bbowl1]

I first noticed this with factory 123gr amax and now I am seeing it on my aa brass loads.

Pin hole through the primer with some "soot". Is this normal? I used to see this with my old custom build .308 on occasion.

Out of the 40 hornady factory 123amax at least half did this. Far less common now with AA brass and win sr primer.

I should note the rifle is a 24" AA complete upper with a geiselle 2 stage. Shouldn't be striking too hard...

My load is below max published and far below what I see others doing at 27.8gr xbr8208.

Second pic is the usual strike. Only 1/20 with my load are like first pic

 

[FCS]

Pull your firing pin out and look at face, probably got eroded from the initial pierced primers. Might need a new firing pin.

 

[Bbowl1]

The upper only has about 300 rounds through it. And I have pulled it and it looks like a normal ar firing pin to me. Nothing unusual.

 

[Bbowl1]

Oh I see what you mean. I will check the face for pits or anything unusual, I didn't look at it very close before.

 

[Bbowl1]

The firing pins face looks completely normal as compared to my others. Should I just replace it? I can't imagine anything else could cause it unless the hammer was striking too hard. But like I said, geiselle, unlikely I think

 

[TexasGunTrustLawyer]

See if you can find the little pieces of punched out primer

 

[Bbowl1]

You mean when decapping?

 

[bjay]

you sure firing pin is not overlength? pull bolt out drop firing pin and see how much firing pin does sticks out

 

[Bbowl1]

Not sure how I would measure that. I guess I could put a pin next to the protrude of the pin and get a rough number

 

[Headquarterz]

Not sure how I would measure that. I guess I could put a pin next to the protrude of the pin and get a rough number

You get a fairly close measurement with a set of calipers. Use the rod that sticks out when opening the caliper. Measure the bolt to face then measure bolt to fitting pin whilst pushing the firing pin out to the fire position then take the difference. That is your protrusion measurement.

 

[Bbowl1]

I really couldn't figure out how to get any type of measurement I felt was accurate.

Visually side by side with a ar223 if anything the protrusion looks less. Definitely not more

 

[Sniper260]

Weird

 

[KUSA]

Firing pins are cheap. Change it out and see what happens.

 

[Bbowl1]

Firing pins are cheap. Change it out and see what happens.

Yep, ordered one

 

[Bbowl1]

No more holes with new firing pin.