9.3x57

[heronfish]

yesterday was my first stab at reloading for the 9.3x57
Just got it from trade ex.
Loaded with a 250 gr barnes on top of 45 gr blc2 and winchester lr primer.

Didn't put it on paper, just wanted to test function.

Inspection of the brass revealed the primer starting to back out.

So what's going on here, and what my next step.
I ordered a bag of cast as well for this rifle, so that will be an option in the coming weeks.

 

[sawzall]

My guess would be excessive head space.

 

[tletang]

If it's headspace you may want to blow out the neck and slowly push back the shoulder until it just chambers reliably in your rifle. Here is a good 9.3x57 article