Originally Posted by
John Taylor
The original firing pin is a little large for high pressure rounds and the primer can flow back into the firing pin hole making the action hard to open, can also cause ruptured primers. Going to a smaller firing pin the hole must be bushed to a smaller size also. On most Cadets the firing pin is close to .125", I usually take them down to .080 or .070". I cut the breach face about 1/8" deep with a 1/2" carbide end mill and solder a hardened bushing in ( black Loctite will most likely work fine ). The original firing pin has a body diameter of 7/16" so going to 1/2" bushing give a shoulder so the bushing is not driven back into the bolt. Learned from experience that smaller diameter bushing can give problems. Reason for using carbide end mill, some of the breach blocks are case hardened. I usually use pre hardened spring steel for the bushing ( old car springs ).