I just got a mod. 94 30-30. I have a Lee 309-150F mold and 30 cal Gator checks. The checks seat fine on the boolits and running them through a Lee .314 sizing die crimps them on well. The boolits drop at .310 so I believe they would work "as cast", but I don't know if the check would give me trouble being so oversized. I haven't built any empty brass yet to try a dummy round.
I plan to get a .309 or .310 sizer, but I can't get one locally so I have to order online. I'm not in a hurry to blow up my gun..... just wondering if this would be useable as-is.