I use 300 WSM load data as a starting point now days. Current powders used unlike 300 H&H wich has dated powder info.
True on old H&H data.
No one seems to want to work up loads with new powders.
WSM vs. H&H water capacity, Nosler Data, both with 200 gr. bullets: 68.7 gr. and 77 gr., respectively.
So, based on an 8.3 gr. advantage, one would think the H&H may handle up to 12% more powder. I'd go easy with that number, not use it as an absolute, just a ball park, drop back and work up.
They are different rounds from different centuries, SAAMI pressures may be different, etc, etc....
DF
