Re: .270 For Moose?
If the moose presents the broadside shot (if the country is fairly open you will normally get this shot presentation), then the .270 thru the middle of the ribs will be lethal. If your moose doesn't present that broadside shot, then I'd prefer something heavier. For example, I had one bull jump up inside the edge of the brush and run away from me at a range of about 175 yds, heading into the thick stuff. My .338 Win Mag brought him down with a shot that raked into his spine. However, most times you'll get the broadside shot, if you allow it to present, in my experience.
If I were purchasing a rifle focusing on Alaskan moose, I step it up to .338 unless I was recoil shy.
If I was hunting Alaskan moose with a .270, I wouldn't expect any significant handicap with the broadside shot into the ribs. One shot would do it, with a quality bullet expanding with enough retained velocity/energy. Most moose will be shot within 250 yds.
Since this is a LRH forum, if you were setting up specifically to kill a moose at 600 yds or farther away, I would shift my preference and encourage a larger magnum caliber. I've shot a number beginning at 500 yds and on out to 750-800 yds. All with .338 caliber bullets. Beginning with the .338 Win Mag and topping out with a .338-.378 Weatherby Mag. A single solid broadside hit to the middle of the ribs will bring them down. If they go farther than 60-80 yds after your first shot, you better presume it was a bad shot - or you missed.
No need to muck up the front shoulder meat. Aim just behind the front shoulder muscle, mid-height on their rib cage. Then give them a minute or two to fall over, provided he doesn't trot off too far. Once they move off more than 60-80 yds, and especially if they're still looking healthy/alert, you better be believing the first shot wasn't on the money.