Excuse me for being a bit thick, but do I understand correctly, if you get good performance with powder X, you should get very similar performance with another make of powder with very similar burn rate ?
May be similar burn rates, but checking out the Lee manual shows very different MV's Vit N150 & N140 being some 200fps at least slower than H4350.
The nearest Vit. derivative propellant providing closer MV's in the manual is Ramshot Big Game, a Belgian propellant from a company now owned by Lapua.
My burn rate chart shows Ramshot Big Game propellant but much closer MV's, as being a little faster than H4350 & (faster) next to Vit. N140 also with much slower MV's. (again some 200fps slower) ATB
Thanks, your a true gentleman, I've now got some sorted, a result ! I was really not looking forwards to having to mess about sorting a new load out just when I've got this one working well. Its just a pain in the back side and a waste of time having to fiddle about like that.
If anyone hears of some more then please just PM me as I can always have a bit spare.