While Remington has a long history of coming up with some very, very good cartridges, that history also contains a lot of truly boneheaded moves, shown by the market performance of some of their designs.
Also the long, long rivalry with Winchester meant both companies have been ...reluctant..to chamber their rifles in the other guy's cartridges, UNTIL/unless market success means they have to, or lose money.
.308 Winchester is one such. Winchester "grabbed" it from the military, and put in on the civilian market as their own. It's such a good round, Remington literally HAD to follow suit.
When Winchester came out with the .243, Remington (a fateful year or so later) came out the their round, the .244 Remington. Based on the 7x57 Mauser case (via the .257 Roberts, still at that time a wildcat).
Remington screwed up, with their concept, however, misreading the market, badly. Warren Page and some other gun writers were touting the 6mm bore size as being excellent "dual purpose" rounds (deer and varmints). Winchester listened, and gave their .243 a fast twist, so it would stabilize the 100/105gr deer bullets. Remington considered the .244 a varmint round, and used a slower twist that did not reliably stabilize deer bullets. .244 sales were...unimpressive to start, and never got better, even when, after a couple years production they went to a faster twist barrel.
Remington tried to save their round, renaming it the 6mm Remington, and using the faster twist in the rifles. Didn't work as well as Remington hoped, and while the 6mm Rem isn't dead, yet, its been on the endangered list for a long time.
Remington hit a fair winner with the 7mm-08, the .308 case size and 7mm bore are a very good match. SO good, Remington didn't bring out the .260 for a long time after most of us figured they should have.
Possibly they delayed the .260 to keep 7mm-08 sales up there, possibly not, but either way, they ALMOST waited too long to bring out the .260.
What the .260 has going for it is the .308 parent case (fitting short actions, and available everywhere) and the long proven ballistics of the 6.5x66mm Swede round.
what the .260 has working against it is the other rounds that offer close to the same performance, and were made to work in AR pattern guns.
In a bolt gun, a round with a length optimized for an AR (10 or 15) doesn't have much, if any, advantage. Especially if your bolt gun has a longish throat. The high BC of the 140 and 160gr 6.5mm spritzers gives a very flat trajectory (comparatively speaking) at even moderate velocities.
The 120+year success of the 6.5x55mm Swede proves a flat shooting, mild recoiling round quite capable of taking down moose, and everything lesser is a reality. The .260 Rem, in a bolt gun, will do just as well, and uses a common case, designed for short actions.
If I didn't already have a couple of 6.5x55 Swedes, I would get a .260 Remington.