IMR 4831 and H 4831 was always my powder of choice with the .300 Win Mag. RE-19 would work well, and I've heard some guys say the IMR 4350 works. I always used Magnum primers also b/c it's difficult to get consistent powder ignition when loading more than 60, 65 grains of powder. Good luck and enjoy
There is alot of good powders out there to use. The thing I have found is to pick a few that are ranked high for that caliber and then work up some loads from there. The ones I would try would be IMR4350 and I am a Alliant powder fan so I would try the new RL-17 and RL-22.
If you're lucky enough to be on private land and can leave your stand up during the off season you can tie an old piece of cloth or something of the sort to your stand. I like to use an old camo bandana that I have. That way the deer get used to the movement and eventually don't bother even looking up when there is slight movement. This may just give you the time to draw your bow or raise your gun without being detected.