I have a .458 from Green Mountain. It seems to like bullets in the .454 range. I am making my own bullets with a lee 459-405-HB Mould. Mine pours a 385 gr hollow base bullet. I then size them to .454 and then to .451 then I paper patch them and then I size them to .454 and then again to .451
I am getting some amazing groups with these bullets. Here are a couple of groups. One was shot naked one was shot with paper.



This next picture is of three 45 cal bullets I make. The one on the left is a Lyman Whitworth bullet 475 gr. The next is the Lee 385 gr and the last is a Lee mini 300 gr. Ron