Are these bullets for a paradox or fully rifled barrels? The bullet diameter needs are different for each gun, as Ross Seyfried found out.

As far as the bullets expanding after casting, I've not seent his myself - I only use pure lead in the ML's and WW's for modern-type guns. It's been 25-30 years since I used tin/lead alloys - the detailed cast bullet memories of those days are just about gone.