Originally Posted by BML
Just checked it. Put one layer of blue masking tape on the case head and the bolt would not close at all.
The firing pin is just barely leaving a mark on the primers so my guess is it's not a primer issue.
Is it safe to assume then that its a firing pin issue?
There's only one way to find out, disassemble the bolt and find the problem, it may be a piece of junk in there or too much lube that has accumulated a lot of dust binding things up. I would also be checking that there are no burrs on the cocking piece that could hang up the firing pin assembly.
If you can uncock the bolt, measure how much firing pin protrusion there is, it should be between .050"-.065", anything less than .050" will give you misfires, anything over .065" can cause pierced primers.