Need to change primers.

[LCazador]

No sir, once fired brass bumped .002".

How do you measure bump? What was your initial head diameter when you started? What is it now? Those three things go together. And where is your seating depth position?

 

[drop_point]

Using the magnum primer will cause more pressure. Back off the load or switch primers. Always work up when changing any component.

 

[jimmymac]

Every case shows flow into the firing pin hole. I’d be looking to correct that situation.

 

[SeabeeKen]

I have a FANTASTIC load for a 270wsm. Using Remington 9 1/2M primers. I have had two pierced primers in 40 rounds, I thought the first one was a fluke. I don't have a lot of experience with Remington primers, in fact I have always used 210M primers for all my Wsm cartridges.

Are Remington primers really soft? I have never had a pierced primer in this action.
I have never had a pierced primer using 210s even in hotter loads than this.

What are the chances of reproducing a load like this? Shot at 200 yards from a hunting bag.
View attachment 1424733
View attachment 1424734

Does anyone know which primer might replicate the specific brisance?View attachment 1424735
I not even sure if this old list was ever accurate anyway.

Any help is appreciated.

According to Hodgdon, you are 1 gr over max and according to Sierra, you are more than 5 gr over max. Might want to back up a bit.
According to GRT, you are over 67,000 psi, although I dont have cartridge specific data for your rifle. Could be more or less

 

[Laurie]

Every case shows flow into the firing pin hole. I’d be looking to correct that situation.

Yes, absolutely. This is a classic firing pin / bolt-head aperture fit.

Just have @Grimstod bush your factory bolt and it will fix your issue. No wondering.

There's almost certainly your answer - if you want to continue with that load which is obviously more than your rifle / primer model can handle. Replacing the mainspring might help, but that amount of flow shouts of poor firing pin fit.

I have a FANTASTIC load for a 270wsm.

If you don't change the rifle related factors, then you have to sacrifice this load which is pretty obviously unsuitable. Unwillingness to change a 'fantastic' load is often step one on the road to serious trouble.

 

[Laurie]

According to Hodgdon, you are 1 gr over max and according to Sierra, you are more than 5 gr over max. Might want to back up a bit.

Ouch! I didn't check maximum listed loads, but there's a major cause of the problems shouting out loud and clear.

 

[46and2]

Sierra isn't shooting Berger VLD. Nor HBN coated bullets. Nor using a long throated chamber.

 

[SKWERLZ]

Yes this factory Savage firing pin hole is sloppy. I wonder if PTG bolt face would be of tighter tolerance?

It made a difference on one of my old savages

 

[SKWERLZ]

No sir, once fired brass bumped .002".

So this occurred on the second firing of the brass?
If so fireformed brass will offer show pressure on a load that seems fine on virgin brass

 

[46and2]

So this occurred on the second firing of the brass?

I was using a different primer and lower pressure load for fireforming.

 

[drop_point]

I was using a different primer and lower pressure load for fireforming.

You may or may not have fully fire-formed the shoulder if you were using a lower pressure load. Sometimes it takes me two firings. Either way, looks like you need to start over.

 

[Laurie]

Sierra isn't shooting Berger VLD. Nor HBN coated bullets. Nor using a long throated chamber.

Material factors which you omitted in your original post. Nevertheless, that load is over-pressure for your rifle as it currently stands.

 

[nakneker]

At the very least I’d get a new spring, reduce a grain and see what the results were. Get the bolt bushed, a new spring, find some 210s or reduce the load and stick with 9.5s

I think your getting some good advice on the your dilemma From the previous posts.

 

[LCazador]

I think you need to check head diameter to see where you're at. If you're out more than .001" over the original new brass dimension, than your load is too hot.