Might Be Best To Employ Hard Military Spec Primers
This subject is open to debate. Since your fine rifle doesn't employ a firing pin retaining/return spring, it MIGHT be best and safest to use only military specification HARD PRIMERS when you reload. Your firing pin floats.
The intention here is to prevent an occurance where your rifle MAY double using handloads with soft primers in an enviroment that MIGHT raise questions concerning the legality of your rifle. Hate to have the BATFE knocking.
Others WILL post stating that they have NEVER had any problems with soft primers and they are exactly correct. Low order of probablility. We are discussing here the POTENTIAL for a slam fire, no matter how likely or unlikely.
How low of probability is a low order of probablility? Dunno. Rack some rounds thru your rifle and examine the primers. You will see a small dimple strike. May never be a problem with soft primers, but why take the chance? HB of CJ