You'll likely get a lot of opinions, here's a free one so take it for what it's worth.
I think a .270 can do all of the 7 Mag's work just as well out to the 300 yard shot at a moose, there's just not that much difference where I think it would be worth trading rifles. If you're looking at upgrading to a rifle that is better at shooting moose at 300 and beyond, I think you'd be better off stepping up to a .300 Winchester or one of the other .300 magnums out there. A .338 would not be out of place either, doesn't shoot as flat though.
Too bad you couldn't keep your .270 for your deer rifle and get a .300 or .338 for moose. I use a .300 Win. for everything and it serves me well.
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