RE: What caliber for moose, elk, bear, deer
If you want a 7mm rem mag get it as the recoil between it and a similar style 3006 is not a lot. Nothing wrong with a 3006, it just you expressed interest in the 7mm rem mag. I know from personal experience settling on something else b/c somebody said it might be better doesn't make the itch go away..go with your gut and enjoy!
Like mentioned just buy the rifle that fits you and recoil will be tamed A LOT right out of the box!
As far as recoil being bad onthe likes of the:3006 or 7mm rem mag, if you can handle a 12 ga. shotgun with 3" shells either should be well within tolerable ranges in report.
The .308 win is not bad either, though IMHO I'd rather have a .270 win, loaded with a 150gr Nosler Part, Barnes, etc.I have used both of these carts for larger then deer, BTW.
Being your first CF the 300 wm/wsm might be a bit much to start out andforget the 300RUM itfor sure isn'ta starter cartridge in the Big Game Rifle world.
Good Luck