I got a mould of a .446 diameter "money" bullet - 535 grains - from Buffalo Arms. It patches up to .452 diameter. Wiping tween shots and with 47.5 grains weighed or 70 grains measured of Py----x Select produces excellent groups at 100 yds. I'll have to shoot farther when I can get a chance.
However, I shot over snow and finally found what was left of my patches (never coould find anything of the .458 diameter patch). All I could find was the bottom of the patch with burned paper leading up to it. I did find a hunk of lube. It looks like it was blown out the bore before it melted.