Lyman Double Cavity Mould Blocks (37583) 36 caliber. For .36 Colt Navy Black powder. and/or 38-55 Rifle, Gallery/ Cowboy action shooting. 89 Lead 145.5 grain bullets from the mold included. Mould model not in production, MSRP of Double cavity mould is $89. I'll take $60 for the Mould blocks and bullets.