L579 Firing pin adjustment

[Guest]

I have an older L579 that needs to have the firing pin depth adustment checked. I cannot remember the setting for this. I thought it might be 58Thou. Can someone correct me if I am wrong?

 

[misako50]

Chances are that it will not be the same with an old rifle (chamber wear and reloaded cases). I would try and use that setting with" Primered Only" cases to see if they go boom or pierce the primer. You have no doubt found that the small set screw needs to be removed so the pin can be adjusted without ruining the threads on the rear of the pin. I have heard 57 to 59 as a rule of thumb so you may have a good start. Once you achieve success, you can use a mild round to see how the "dimple" looks on the primer. Keep your face safe.-Mike

 

[Guest]

Make sure you loctite the set screw into place in the milled slot in the firing pin. The darn thing will worry itself out enough to allow the firing pin to back out a lot. It will still fire, but can't help even ignition.