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6BR problems

I chambered an 8 twist barrel in 6BR and I am having problems with pierced and cratered primers--My first load was 30 grains of varget rem 7 1/2 primers and 108 Bergers every primer pierced--Next load was 29 gr Varget velocity 2700 shot 4 shots every primer pierced plus a stuck case I had to tap out with a cleaning rod I think the barrel is an 8 twist It was originally a 6 XC I cut the chamber off and went with the 6br--Any help will be appreciated
 
Not sure on the chamber specs it is a no turn neck
In your original post, you stated that "I chambered an 8 twist barrel..." then go on to say "Not sure on the chamber specs...."

Did you actually chamber the barrel, or did someone else? What's the freebore and neck dimension?

If your barrel has a tight neck, or short freebore (having to seat the 108 Berger deep in the case), would both easily contribute to a "typical" load being too hot in your rifle.
 
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I chambered an 8 twist barrel in 6BR and I am having problems with pierced and cratered primers--My first load was 30 grains of varget rem 7 1/2 primers and 108 Bergers every primer pierced--Next load was 29 gr Varget velocity 2700 shot 4 shots every primer pierced plus a stuck case I had to tap out with a cleaning rod I think the barrel is an 8 twist It was originally a 6 XC I cut the chamber off and went with the 6br--Any help will be appreciated
30gr. is where some guys end up, but probably not a good place to start.
Are you sure you’re not using REM 6 1/2 by mistake.
 
In your original post, you stated that "I chambered an 8 twist barrel..." then go on to say "Not sure on the chamber specs...."

Did you actually chamber the barrel, or did someone else? What's the freebore and neck dimension?

If your barrel has a tight neck, or short freebore (having to seat the 108 Berger deep in the case), would both easily contribute to a "typical" load being too hot in your rifle.
The neck is a no turn neck the freebore is for berger 105 bullets I don't have to seat the bullets deep in the case--I chambered the barrel myself with a reamer that I have done 3 other barrels with and had no problems
 
For some reason 30 calibers don't seem to be affected as bad, Once you get to 6.5 is when it starts to show problems, At least that has been my experience. Show a pic of your 308 primers and I will be willing to bet they are "Extruded" This is where the cup flows past the firing pin and into the space between and it and the hole, The extrusion will stick up proud.

Edit: Here is a pic I grabbed from Google, See how the cup material sticks up proud.
1730599728403.png
 
I can explain it like this, If you put a piece of glass over a 3 inch hole you can step on it and it won't break, You put it over a 6 inch hole and it will break. The same thing goes for the cup, The surface area of the firing pin hole is too large to hold the pressure, If you reduce it, It can hold it fine.
 

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