My only foray into using cast bullets in the .30-30 did not work out too well. I bought a box of 500 170 grain lead bullets from Missouri Bullet Co., and tried out about every powder and loading from the Lyman Cast Bullet Handbook. I never could get anything approaching a respectable group from my Model 94 (with receiver peep sight). Typically > 6" at 100 yards. Including some much worse groups.