Heya Katch,
First off, it sounds like what you're using will work fine. It's close to what I use in my T/C .50 cal.
I use 85 grains of FFF with a 348gr powerbelt bullet(hollow-point lead). Powerbelt bullets are awesome I gotta tell ya! Note that I use FFF...it seems to have more reliable ignition and a quicker initial "ooomph". But if you go to FFF you don't want to use any more than 85 grains because it'll be too much pressure and you may crack your stock if it's wood. The couple times I've tried 90 grains my accuracy begins to diminish anyways. 85 grains seems to be just right in my rifle. The 348 grain powerbelt puts deer down "right now", assuming a hit in the neck or chest. And talk about expansion! Yowzza!
I can't tell you what it'd do to an elk hit in the neck or chest because the only one I've shot was right in one ear and out the other....never seen an animal drop so fast and so permanently!
Good Luck and straight shooting! Moe