367/300 SuperSlug (BC= .33)
This is also an experimental caliber. It will be very useful as it betters the ballistics of the much loved 38-55 of yesteryear. The bore mikes .368 land-land, with a groove depth of .375. Twist is 1-14. Bullet is cast weighing 300 gr. at .368 diameter, then is sized to .367. It is accurate and hits hard with 80-90 grains Pyrodex P. It’s sure to be a good killer on deer sized game. Recoil is surprisingly mild. A similar combination was used by the White Muzzleloading target team to win the 2007 Manufacturer's Match with record score.