Today at least was a partial FAIL using a Saeco 740 mould for my 450/400. Cast some straight wheelweights, they came out at .40975 or so. Stuffed one down the muzzle, one handed it thru.
Saeco says it should go .412 with Lawrence Magnum shot. Well, that may be,not this one with wheelweights anyway. I have some Canadian Extra hard shot here, see what that does for me in the AM I guess. I did manage to get the gun slugged,.410 at the muzzle and .4115 in the throat.

I noticed 470Evans had posted in 2006 on using IMR4064 with 300 Horn and the 400 Woodleigh. I also found some data on it with 400gr bullets and some othere powders in Grurifrasca.net. Anyone else tried 4064 in the 450/400?

And , has anyone seen anything on using Sr4759 in it? I see stuf for SR4759 on the 416Ruger and Rigby,
perhaps no one has tried 4759 yet?