For what it's worth, I haven't got any info with H4350, but this is what I have with IMR 4350. It's a old load with a 160 sierra game king-64grn,IMR 4350,CCI 250 mag primer,WW brass. Should get you to around 3000fps. I don't shoot 150 grn bullets, but this might give you some referance. Also another load that my 7mag likes is 71grn of H-1000 same everything else,also this is in my old gun with a 24 in barrel. I have another 7mag(model 700 PSS) that loves H-1000 an 180 Bergers. Sierra makes a great bullet, I've shot them for years. As far as the load data,if you use 4350 you might want to start with about 61grns and work your way up. See what your rifle likes. It might like differant powders also. H-1000, Retumbo, SC 4831. Hope this helps.
I need 2 know where to start my loads and what the highest charge is ?
The powder I will be using is H4350
Bullet 150 Match King
I have an older sierra load data book but it doesnt list the 150's .
Thanks for your helpgun)