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Never said one was "better" just that they will do the same thing.
If you have a Swede you don`t need a 260, same as a 7x57 will do anything a 7-08 will. The only real gains are the "08" based cartridges fit short actions if you are worried about that type of thing.
I`ve a couple 260s, I`m also on my 2nd 6.5x55 BBL on a Mark X action and have had 3 other Swedes, a M96, Rem M700 classic and a sporterized M96. I also have had 3, 708s. to be honest every one of them would do darn near exactly the same as the others on deer size game.
All will drive 140 gr bullets to 2800 fps comfortably at equal pressure (reloads are needed to do this with the 6.5x55 and 7x57), penetrate very closely, and shoot just as about as flat. They compare very similarly to the difference between the 280Rem and 284 Win.
I don`t have and never did a 7x57 but the 260 and the Swede cases are within ~4gr of the same water capacity and I`d esimate the 7mm to be very close too. The newer cartridges operate at higher pressure with factory ammo and will do more if you are not a reloader but otherwise they are all great rounds.
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