.30-30 chambers traditionally have very little throat. SAAMI spec. has it at 0.015" and at a 15 degree taper. All of my .30-30 boolit molds start tapering at the crimp groove and/or have bore riding nose profiles. The Lee 100 grain RN does not really have a crimp grove and while designed for .32 revolvers I believe they will work if you seat them deeper.