I have been loading for 308 and 300bo and sometimes shaving lead, or ending up needing to flare the mouth a little. The Hornady powder drops don’t come in 309 size?! Anyway what I found in my kit is a 32/20 cowboy set from rcbs. This set has a wonderful flare die that I tried for these cartridges with great success. It even has an M die step type shape.
Just thought I’d pass this on if anyone is finding they need a little help starting bullets in sharp edged cases.