I've just got a .311 Lee sizer for my C312-185-1R mold that throws slugs at about .313.
I was hoping the .311 was going to be perfect for my 30-30 Marlin with micro-groove and also my Stevens bolt action 30-30 with a .310 bore with rifling edges down to .305
But the loaded cartridges won't chamber in either rifle. In the stevens, with force, the bolt will close but won't turn down. The Marlin won't lock up.
Details: full length resized and the brass works fine without the bullet.
The bullet goes in easily, but the OD of the neck increases about .01.
The next Lee sizer is .309, is that the solution? and can the C312-185-1R be sized down that much?