Just measured my Zero 44 bullets. They were .429. This was a handful grabbed at random out of the box. I have loaded them in several 44 revolvers with excellent results. Real world results not speculation. I priced the coated bullets the Zero were cheaper and since I will never shoot 5000 a year I am not to concerned about wearing out a gun. I still shoot cast and always will but I find no problems with the Zero jacketed bullets except I need to order more for the future.