i had issues with cast bullets in 8mm mauser as i could only gas check them through a .323 lee sizer die and i coulnt hit anything and i mean anything at any distance,,,,,shell house reloading made me some bullets at cast rather than ,323 so they came out at .325 which i had a bullet sizer to gas check......my barrel wanted bullets at .325 to .326
it finally put bullets on paper at 100 yds.......2 thou made all the difference