Like I said, very little pressure is applied to in the process. And I forgot to mention it works even better on straight wall pistol cases. Oh, no, I did not pull the bullets first.You probably squeezed the bullets smaller by 0.003"-0.005", depending on the brass neck wall thickness. The round may still shoot straight if the bullet has been seated high so that there is still correct bearing surface left to engage the riflings. It works if it works. But it is not something desirable.Good thing I did it before I read Post #11, otherwise I might not have known the process would work!