Reply To: sizing die
I’ve never tried it, but to make a .446 pellet head go to .451 I’d think you’d need a decent amount of pressure from directly inside the skirts and behind the pellet head and you’d need a die for the pellet head to fit into so it can expand. Might even need to heat the pellet / die to help it along.
At that point, I think it would be better to have a custom full pellet die made and melt down junk pellets and make your own. Sounds like a lot of work there too (and probably $$ for the custom die) but I’d bet someone out there does that.