Ill give them a try but I really like full form sizing over smooth sizing GM54-120. And it works much better with .458's. That is probably the reason I am not getting the pressures you were worried about with me hot loading. I'm not shooting competitively with this thing. As long as I can keep my shots in the vitals out to 300 yards, my main concern will be terminal performance of the bullet. I just did a google search and found where ronlaughlin did one of his water just tests on this bullet some years back. I have to say, I think the bullet will do just fine.