"One thing that can happen is the rifle firing pin can perforate the bottom of the pistol primer cup. This can damage the firing pin and sometimes erode the breech face of the firearm. The pistol primers have a thinner cup bottom than a rifle primer. Also, CCI pistol primers typically have less priming compound (or a different formula) than a rifle primer. Thirdly our pistol primers have a 'shorter' overall height than the rifle primers. They may seat too far into the rifle case primer pocket and result in a misfire".

Linda OlinCCI/Speer Technical Services2299 Snake River Ave.Lewiston, ID 83501

I only use what the load books tell me to use, unless a manufacturer tells me otherwise.

Regards,

Hobie