If you want to load anything larger than a 222 with the small primers get the Wolf Mag primers. They have a thicker cup but have the same primer mix as the standard. The thicker cup will handle more pressure. I have used some of the SR Mag primers in 223 loads for my AR and they have really worked well. I used some of the LR and the only problems I had was in one rifle and it was due to me not knowing about how to seat these primes. The anvil seems to stick up just a bit more than primers like CCI. When you seat them you really have to pay attention to getting them bottomed out in the cup. With my Lee priming tool I felt the anvil hit bottom but you have to give it a bit more pressure to feel the cup compress the anvil and hit bottom of the primer cup. I had a couple of misfires until I found out the proper way to seat them. A friend that is a bench rest shooter turned me on to the Wolf primers when they first came out. He says that he will shoot nothing else becasue he gets the best groups using them. The numbers on velocity are better than anything he has ever used.