I have a 30-30 Marlin and have some lead boolits for it that have been sized to .310. They are big ol 150 grain flat nosed boolits with a large hollow point. I do not want the case neck to size down the boolits any or cause problems. My questions is: Does anyone know what the stem dimensions are on the 31L Lyman M die? I am looking for some way to expand the neck to as close to .310 as I can get without over expanding. Help! james