Thanks for the advice so far.

Just ordered the Lee Ultimate 4 Die Set from CDSG. Waiting on the DM80 mod from Dave Mercer before I shoot the rifle. Might have to try some of those 140gr S&B rounds to zero and break in the barrel.

I'll have a look at the Vhit N555 and RS62 powders, I think. Shame you can't buy the Vhit in 1lb tubs over here!