I should stay out of this but I'd agree gear if you're bumping just the nose to make it bore ride. But you can "bump" the whole bullet to make a difference. I suppose here it's what is bumping and what is swaging. We weren't swaging "blank" cores etc. but we did change shape a fair amount as they came from a mold as well as increasing diameter a bit. This required a custom die and the truth is it would be as easy to make a mold but it was interesting to try. And understand this was quite awhile ago and I don't do much of this kind of thing anymore but it's interesting to read here about others experiments....well....until things go awry......smiles.