(01-06-2022, 02:25 AM)Old Marine Wrote: Had 3 Win. primers pierced in 2 different loads with different powders today. No indication of pressure issues like flattened primers or stiff bolt extraction. These are older standard primers in white boxes and have never had a pierced primer in 40 years of loading. I have not had any issues with these primers of any kind. New rifle and no problem with factory ammo (200 rnds) and wonder if there is fireing pin problem with soft prmer issue?
Boils down to incorrect primer for this cartridge. The Win SR primer cup thickness comes in at .021" VS Federal 205 at .025". Cup hardness may be another variable that may play in with issues like you are experiencing. Not to say you can't work out a compromise.
If you were to continue with the WSR primer a lower pressure / velocity load would need to be worked up. Old adage of back off 10% on powder charge & work up may apply here.
Link below from BR form touches on this nicely IMHO. Post 15 may deserve the most focus. This should help clarify why primers are not directly interchangeable.
https://benchrest.com/showthread.php?520...-Thickness
Not to say the form of your firing pin may not play in here, I have experienced Improvements in such issues with factory loads that gave me similar issues. In that case I was of the opinion that the factory loaded 204 ruger load was using a REM 7 1/2 primer. Firing pin was more pointed vs a .030 Radius for example. The right touch on a buffing wheel cleared up that one nicely.