[m&p45acp10+1]

I load for a bolt action, and have had good luck using standard CCI small rifle primers. I have used Winchester Primers with the same loads, and the results were too close to tell a dirreance.

Then again I am not shooting an AR, nor do I (or likely will) shoot in exteem weather. If it is under 45 outside I am staying it. Here in this part of Texas it will usualy warm up in a day or two. If it is hotter than 95 in the shade I will either shoot early in the morning, or in the evening after it has cooled down. I have other hobbies that can be doen inside.

I would say when in doubt. Go load up a few from starting load up to the load you were using. If you see pressure signs before reaching the load you were using, or accuracy falls off go with the one that gave the best accuracy.