I own 2-.270’s, a 7mmMag a 7mm-08, and 6-.30/06’s!
The .270 shoots as flat as a 7mm-mag, kicks about like a reduced recoil load in an ‘06. Barrel life is slightly less than an ‘06, but much better than a .243...
The 7mmRemMag was designed, intended, and created as a gun that shot a 160gr 7mm bullet as flat as a .300H&H mag with a 180gr bullet, but recoils like a .30/06... John R. Sundra, a gun writer of the late ‘50’s and 60’s and co-hort of JCO’Connor was in on the design with technical staff of Remington.
The 7mag was designed as a “Loaner rifle” for outfitter/guides to loan guest elk hunters. 1st an elk gun secondary a “deer” rifle.
The 7mmRemMag has reached ubiquitous status akin to the .30/30 and .30/06, and .243.
I say this as a 25yr career game warden who saw many put to use.
Like a previous poster stated, YOUR intended use dictates your choice.
If deer/antelope/black bear is your primary use, with Elk and Moose secondary, get a .270.
If Elk are primary, get a 7mag. If hunting timber or where Brown/Grizzly are prevalent, get a .375Ruger.....
I bought my 7mag (Remington M700), on clearance at Walmart for less than 4 bills, out the door. Less than a barrel in .280AI.. I already had brass (range pickups), components (same as 7mm08), and dies (Lee bought for $10 at flea market). It has a synthetic stock, a 26”bbl. shoots MOA... Uses powders I bought 20yrs ago for $5/lb.(WC860, H4831).
Recoil is indistinguishable from a .30/06.
Neither is on-game performance, to 400yds....
You won’t likely see any useful difference between the 7mag with a 174/175gr bullet vs. your 6.5Creed with a 140gr bullet. If a little more recoil is a concern, just stick with the little 6.5.
BTW, I also have a RemM-7 in .260Rem.... NOT my choice for elk, but it would do...
Your pick!
Last years deer shot with .260. 120gr Speer HotCor @2,870fps. Range? 22yds! Entered left front shoulder, lodged in paunch. 140gr @2,650fps (20”bbl) would have exited. Did I mention that it’s a 1/2 MOA shooter w/120-123gr match bullet over RL17, RL22, H4350 or IMR4350. Gags on Varget!