You don't need a big press for this.

Quite a few years ago, just for fun I knocked up a very basic swage die from scrap mild steel, to bump 350 gn .458" round nose Hornady bullets up to .474", to shoot in my .470 double.

I just used a 5" bench vice to expand the bullet into the die.

In the photo, with the two bullets together, the one on the right is the standard .458" and on the left is one resized to .474". The one in the mike is also resized to .474"

One shot from each barrel will go into 1 1/2" at 50 yards, and they seem to hold together ok on game.