The Lee mold that you mentioned was the first one that I bought, many long years ago. A single cavity at that. Now, while I've never shot anything with my 30/30, I used to load up two boxes every year for my now deceased hunting buddy, and he's killed quite a few Alabama whitetails with my handloads in his Sears lever action. My youngest son did use my rifle to hunt deer with, and he, too has taken quite a few with said boolit. Cast from COWW with a gas check and sized w/ a Lee sizer it did well. I still use the mold and sizer for both plinking and fire forming cases with my 30-06 A.I. and recently started shooting the 30/30 again, but at paper.... Hoping to get it rechambered this month to 30/30 A.I.