for what app???
if it's for BP/muzzleloader, you should be able to get a custom mould made. if you're looking for a "modern" caliber, you'd have to get it classified as a DD under the NFA
Kampilan, I am looking for 750 gr. jacketed bullets for a 577 Tyrannosaur. I know that Barnes, Hawk, Woodleigh And DKT make bullets for this caliber but I was wondering if some other custom bullet makers made bullets for it also.