punching holes in primers

[tuknal]

im asking this for a mate , hes a harvestor that does around 200 p/w
hes recently had a new barrel put on his sako 85 223 and ever since its been blowing holes in primers
ive heard headspace being blamed but i dont see how this would be ,,but im no expert ,, how can headspace make primers blow holes ?
the only ammo being used was ADI soft points bulk pack ,and this has only happened since getting the rifle back so something has seemed to of changed with the rebarrel ,,but what ??
has this happened to anyone or does anyone know of a cure
hes gone back to reduced handloads without an issue ,,from 25gr 2206H to 22.5 with 55gr projectiles the loads are working for him but if your rifle cant handle factory loads then something is wrong
the smith that did the work is at a loss as to why ,the smith is in Vic he is NSW and its a bit of a stuff around to send it back ,but it may be the only answer
so im just asking for ideas or if anyone has had a similar thing happen and what was the cure

[Wapiti]

I have had it from factory overloads from rubbish ammo and have seen it from other rifles too.

Do you mean that the primer comes out of the pocket, or discs and just the firing pin indent blows out?

Sometimes a change in chamber dimensions, including headspace, can completely change a rifle's tolerance.
The same reason that two rifles, consecutive serial numbers, from the same maker, behave totally differently with the same ammo. One it is a mild normal load, the other too hot. It's dimensional differences in the chamber, throat length and bore, and even the finish in the barrel.

There is no way to find out why the change, except to measure all and every dimension that has been changed in the rebarrel. Not that easy and not without the gear required.
I'd start by comparing fired cases from the previous barrel to those now. I'd reckon there would be some tell-tale changes to pick up there for sure, and work from there.
I hope the gunsmith test fired the rifle and did this.

[tuknal]

i dont think the smith test fired it at all,,
just blows out where the pin hits ,,
all his old brass would be reloaded by now
i get what your saying but how does increase or decrease in chamber make this happen especially with factory ammo ,isnt it meant to be for allround use
could understand if they were hot reloads ,,ive seen reloads (not mine) that were very tight to open the bolt after firing from being a bit on the high side but never a hole in the primer
correct me if im wrong but aren't chambers finished a to standard size with a reamer ?

[perentie]

Pistol primers might do that.

[tuknal]

well funny you say that
he does use them for his reloads ,but these were factory rounds

[fussy]

Test the same ammo in another rifle; you might have bad batch.
Then test different ammo in that problem rifle.

[Damo300]

Strip a few of the factory loads down and swap out the primers.
Reload and try.

[deye243]

im asking this for a mate , hes a harvestor that does around 200 p/w
hes recently had a new barrel put on his sako 85 223 and ever since its been blowing holes in primers
ive heard headspace being blamed but i dont see how this would be ,,but im no expert ,, how can headspace make primers blow holes ?
the only ammo being used was ADI soft points bulk pack ,and this has only happened since getting the rifle back so something has seemed to of changed with the rebarrel ,,but what ??
has this happened to anyone or does anyone know of a cure
hes gone back to reduced handloads without an issue ,,from 25gr 2206H to 22.5 with 55gr projectiles the loads are working for him but if your rifle cant handle factory loads then something is wrong
the smith that did the work is at a loss as to why ,the smith is in Vic he is NSW and its a bit of a stuff around to send it back ,but it may be the only answer
so im just asking for ideas or if anyone has had a similar thing happen and what was the cure

Has your mate spoken to the smith yet after the third primer piercing the rifle should never have been used until it was fixed now he has probably done bolt face damage firing pin hole will now possibly need sleving