RE: H4350?
It was recommended in my 300win mag but I found alot more accuracy out of H4831.
Everygun has a sweet load. I load alot of 270win with IMR 4831 and find the powder to work well.
H4350 works the best in my 375 h/h
If you have a slower twist barrel I would recommend the slower buring powders. Especially in the larger calibers.