I switched to Winchester large pistol primers about a year ago, and I like them very much. I use them in all my large caliber stuff-magnum or not. They are the only large primer that is desinated for both standard and magnum ammo. A caution I have learned is that, because they are hotter than standard primers, you have to allow for them a little when you start getting close to maximum loads. They can push you over the edge a little if you are using them in .45ACP or other large non magnum rounds. But they are great-no more un-burnt powder, and I havent had one fail to light. Go with caution. Flapjack.