Which powder & how much?

I've got some BTB 330g LFN that I want to load for. I was thinking of using either H322 or H335. In his Tech Notes #3 M. Stanton used 48-50 grains of H322 and 54-56 grains of H335.

I want to reload the 330g for moose. Any guess at what my "range" of powder loading is? Can I use 45 grains of H322? 52 grains? To begin, if I use H322, I was going to start with his 48 grain load and see how my XLR shoots it.

Is there a reason that either H322/H335/Varget would be better than the other regarding hunting applications?

Thanks for any insight.