A friend sent me a 50 cal mold to try in my Swede 12.7x44r Rolling block.
It's a LBT 508 475 HH. The lube grooves are angled, my thought is they look like scrapers for cleaning out BP fouling, but the lube grooves are not very deep so they won't hold much lube.
The second odd thing is the bullets are tapered going from .508" at the base to .496" at the top driving band.
I cast a small pile from 50-50 WW-PB. I'm going to pan lube with new BAC and load in cut down 50 AK brass to try them.
Any thoughts on what this mold was meant for?