What a can of worms?

Personally I don' t believe that there is much difference between the .270 and a 7mm. (.277 as opposed to .284). Though I know there are many that would disagree. If I already owned a .270, (and intended to keep it), and I was going to add another rifle in either 7mm or .300....I' d go with the .300 Magnum. And I would probably pick a standard .300. Either the .300 Winchester or the .300 Weatherby Magnum. Both of them are capable of doing what .300 Magnums do best. Launch a .30 caliber bullet that is both heavier and thus more suitable for game more suited to the .300 magnums, (as opposed to the .270). Your current .270 is already well suited to shooting a longer ranges. So I would assume you want a rifle that is much more capable with heavier game. Either the .300 Winchester Magnum or the .300 Weatherby Magnum with a good 200 grain, (or heavier), premium bullet has to be seen to be appreciated on heavier game. When loaded with a Nosler Partition in 200 grains or more...the .300' s come close to mimicing the larger mediums, (ie. .338' s Magnums).