jimb16 may have the answer. As I recall, I lubed the boolits by dipping them in alox 50/50, no sizing. However, this may be negated because recently I discovered the boolits were sized down by loading them in the cases. I also load cast in .270. 7.62X39, 35 Remington (all with gas checks) but to a limited amount so I can't comment on leading.