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Old March 27, 2012, 10:44 AM   #3
Scorch
Senior Member
 
Join Date: February 13, 2006
Location: Washington state
Posts: 15,247
Sounds like two issues:
1- Your reloads are shorter than the chamber and develop relatively low pressure, causing the primers to back out. Primers backing out is often seen in low-pressure loads because the low pressure does not fully expand the brass to fill the chamber and re-seat the primers.
a- Increase your load. Refer to a good reloading manual.
b- Check the distance to the lands when the bullet is seated, or load to SAAMI OAL specs.

2- The squared-off end on the firing pin may be causing the pierced primers. I would radius the end, making sure it is very smooth. Protrusion should be .058"-.065".

In addition, check the action screws to make sure they are tight and that the bedding is even and no areas bearing on the sides of the barrel. Check the scope bases and rings to make sure they are tight and not moving under recoil.
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