Thread: Help - What is going on with these primers??

youve got nice clean fingernails

Lol cheers

Take your bolt to bits. Take some photos. Especially of the pointy end.

@284 Gypsy Here ya go

The shadows are miss leading. Was going to compare the firing pin to my JW15 one until I zoomed way in.
Z

Finally got a update for whoever is interested on this. The supplier of the ammo had a replacement box from a different batch sent down. Unfortunately the 1st round from the new box punched a hole right through the primer...

I put some other ammo through it right after and it was alright so I'm buggered if I know what's going on

Pull the primer from a fired case and fill the hole with Plasticine . Load the empty case and fire it , it possibly looks to be an excessive firing pin protrusion . Also look at the bolt , out of the rifle , with it in the fired state i.e with the firing pin protruding . A firing pin should not even be capable of piercing a primer to that extent ??? .

They all appear to be struck off centre... if they're all consistently off centre then your FP isn't concentric. If they're randomly off centre then your FP hole is loose. As said, check protrusion when FP is down, and any play. May also pay to check headspace.
Mostly I'd just say it's soft primer cups, and so use different ammo.

It looks like the rear of the case , that is not actually inside the chamber ( ie un- supported ) , seems to be shiney & maybe buldged , if so it would tend to show signs of over pressure , allowing that the brass is correctly speced , you should either feel it by running your finger down the case , or if you reload , try to size IT .
Lapua use to make some Hot 308 ammo for the AI AWs in use with the army years ago , the cases once fired in the rifles , where enlarged in the base area, and you could not reload them , as the overpressure had been enough to destory them in reguards to re-use . They where accurate , they knew it was overpressure , as they put 3 little crimps in place to stop the primer from backing out too much and jamming the action , in the end Lapua stopped making this ammo , maybe too much drama .

I would check your firing pin hole and make sure it's the tolerances are tight enough.

Looks like super soft primers combined with a loose firing pin hole.

I have done that to more than a few 6.5x47L primers with hot but not max loads and soft primers.

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Look at second case down on the right. Looks like a raised ring around the firing pin hole?

If it is, that's the primer flowing back around the firing pin and if it goes a tiny bit further it's going to blast that little metal disc of primer back into your action somewhere.

Did you leave any of this ammo in the sun?




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