Found a twist calculator by some guy named Howell.... Anyway a .495-500 diameter bullet 1.2-1.25 inches long at 1300 fps and the twist rate comes back at 1-26. The original sharps bullet was listed as 1 1/16 inches long.
the most expensive bullet there is isn't worth a plug nickel if it don't go where its supposed to. www.historicshooting.com