Thanks for the replies. I have seen the data on The Vihtavouri website but it doesn't really help for the lead bullet heads I want to load. The one lead bullet they do give data for is 510gr gas checked, and the powder quantity is significantly less than the jacketed rounds.

I currently load 350gr & 405gr hard cast, without gas check. I can put a full charge of 4198 behind these with no issues and there's plenty of data to back it up. The American forums haven't turned up much because they don't use much Viht powder.

I'll keep looking!

Cheers
Greg