i would say you don't need the 300win mag but if you get the urges like i do go buy it. but most of my friends in maine (if the get pulled for the moose tag ) use the 30-06sprg some use the 270win. if you are a good shot and can shoot the 30-06sprg real well i would go with that. i good 165gr. or 180gr. would do the trick. i would probally go with the 165gr. TBBC's or maybe the 220gr. rem core-lokt's all the moose i have seen in maine wher i hunt are real close in the swamps.uner 75yds and seen some out to 250yds. i know a guy who i watched his home video of him taking a bull moose up in boonie land in maine with his craig and jorgenson chambered in the 30-40 krag factory win power points ( 180gr. ) he took 3 shots at the bull moose and dropped him at 250yds. both lung shots. the moose ran maybe 50yds after being hit. but i guess you would get shots over 200yds.

i am not sure but you might want to ask others since i have not had the luxury to get pulled yet. stubblejummper is a very knowledgeable person when it comes his 7mmSTW and 300win mags.

if your shots are under 250yds i would stay with the 30-06sprg than the 300win mag. but if you want a new gun. look a little longer and try to find a " 35WHELEN " . i fine caliber that i think will be a great round for game that size. ( factory ammo rem: 200gr. 250gr. rem core-lokt's and the 225gr. TBBC's )

if you have never shot a 35whelen it is supposed to feel like a stout 200gr. bullet out of the 300win mag. try the site that talks about moose hunting.
i will send you a e-mail about some other things about moose hunting that will help you.that might give you more info on how they did with the 30-06sprg in las years hunt