Homemade 12/70 cartridge for 12 gauge shotguns with a specially sharpened projectile and a huge amount of gunpowder. The recipe is in the top 10 according to "Homemade Reloads" magazine. Uses a casing from a 12/70 "Grizzly 40" round. Only the MTs-255-12 shotgun can handle the power of this cartridge.