Edelweiss:
If you were in Oz the .310 Cadet is a piece of cake to load for.
Unprimed Bertram cases for under a buck a throw, and perfect coated bullets from Hawkesbury River (and other makers no doubt) cheap as chips considering the quality.
Shot one of mine a couple of weeks ago at our "Rorke's Drift" event, as I didn't have enough BP-loaded 577/450s on hand. Felt like cheating!

Otherwise, the old three-oh is certainly a safe call.