The #14 Speer manual list both CCI 400 & 450 on their .223 loads.

The Sierra 5th edition manul list Winchester small rifle primers .223 loads.

The Hornady Seventh edition listed Remington 7 1/2 primers for their .223.

My question is which primer would be best for my situation? Small rifle or Small rifle magnum? I'm curremtly using Varget powder which normally gives a pretty full case. I had been using CCI 400 with good results but thought I might try CCI 450's. Whats your thoughts on using Small rifle magnum vs small rifle primers?