I have never used these primers until now. I am using them in my 9mm. The problem is light primer strikes. Ran 2 different kinds of factory ammo as well today and not a single problem. Put the misfired round back into the pistol and it would go off the second time around. Are these primers just too hard? Pistol is a Sigma SW9VE with a slightly modded trigger. In the last 3,000 rounds I have put through it I have never had a single FTF. I am going to load up a few with some federal 100's and see what happens.