i have a 1895 marlin mxlr with a 24" barrel and am very new to shooting cast bullets. i bought a 340 gr pb lee mold and cast useing straight wheelwieght and let them air cool. then i lightly tumbled them with lee liquid alox and i do mean lightly so there was just a light sheen on them. then i loaded them with 37 gr of imr 4198 but i found that they didnt have very much neck tension after the light belling of the case mouth so i lightly crimped the cases.. but after fireing 20 rounds it had a decent amout of lead coming out on the patch when i cleaned the rifle. do i need more lube or am i running them to fast? i didnt crony them