I dont use pistol primers in my rifle. It has the large square reversible firing pin nose.  Pistol primers are a bit too delicate.  

I was hoping more of the forum experts would wade in on this.  Maybe I'm still not using the forum correctly.  

In either case I'm trying as hard as I can. 

In my case, Frank, I have been assuming that the H108 powder is being blown up to the base of the bullet then on ignition, wedging between the end of the case mouth and bullet base which pounds the neck down.  One case is good for about ten shots. Maybe I should rotate the case and keep shooting?  Seat the bullet deeper? Seat the bullet closer to the case mouth?  A lighter charge with pistol primers? 

The best target I've shot from the bench in competition using IMR 4227 was a 246.  Certainly good enough for me.  I posted the pictures for those that may find them some help or just interesting. Wouldnt mind hearing some good suggestions from the experts on this forum.  

              Joe.  

I really don't think that the priming charge is what is lighter in pistol powers. The material is softer letting the rifle go off with a lighter hammer fall. In many cases this will get rid of stringing caused bu indifferent ignition. if I remember correctly the small primer that goes off with the least pressure is the Federal 205 M. At least that is the way I learned it. If I am wrong I'm happy to be schooled.

40 Rod

40 Rod here is a good article on Small Rifle primers for your enjoyment.

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J.Louis