Those were Barnes Original .510-cal./ 600-grainers with the hole in the base, and having varying amounts of lead smear showing, squeezed out of the "pinhole." The Barnes Buster .458-cal./ 400-grainer has a pinhole at both ends, but they are much tidier. I wonder if that would allow the Buster to be a legal "soft" where solids are not allowed for hunting ?
Now I must render an accounting for your charitable donation of bullets to the Crusade. First the .458-sized/ 570-grainers used in .458 WM+ with duplexed BP:
"Lube star" at the muzzle, and if there was any lead fouling it was minimal, easily cleaned up:
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.