Thanks, I had forgotten about the Precision bullet page and tried some of the things on that page. I tried slower burning powder and seated the 147 bullets deeper. It stop the tumbling but the slower powder made for more recoil and that's the reason I shoot the 147 in Pro. Never had a problem with the 34 Or the M&P shooting thiese bullets, but the CZ doesn't like Clays and 147 Precision bullets.
I just bought a case of the 147gn Missouri lead cast for my UZI. It has a really stiff spring, so I was hoping I could push these a little hard to offset any cycling problems.