Serviceable 250-grain Monoflex and TSX loads at +3000 fps have been found, but first, this duck feather tickle of a paper patch load in a .458 Winchester Magnum throat atop .45-2.6" brass, with training wheels:
There were little specs of lube and BP on the chronograph at the end of the day, even with 7-yard distance from muzzle. The BP shooting was done late, with sun angle bad, clouds had rolled in, and even turning on the accessory lights did not help.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.