I have loaded about 10K of 147's and not had this problem. I do use one of the small rubber O-ring style buffers on that brass pin at that station. I don't remember where I got it, but it puts pressure on the base of the shell and seems to smooth out the jiggle just before the press starts the downstroke. As others have said, once the downstroke starts, I haven't had a problem with the bullet falling off. Just something to try.