The only small rifle primers I have are CCI 400,and I have plenty of them. I have used some in my AR that I bought not too long ago,and have had no issues,but I was looking at Speer data,and noticed they recommended CCI 450 with Win 748,which I assumed was due to it being ball powder,but just out of boredom I read up on the 450 primers,and a lot of folks seem to feel they are safer in the AR because they are harder..Have I just been lucky using the 400s so far,or are they alright to use? Thanks