I don't think there is a .260 Win, I would think you mean a .260 Rem. Many are used in competition, myself included.
Its easy to build up you own.. pick up an old Savage 10/110 in .308/30'06 (SA/LA), all you want is the action. Then order a pre-fitted barrel chambered in .260 Rem from PacNor or anyone that that makes a drop in for Savage. Get the headspace gauges and twist it on. Pick up a stock with a competition handrail for it, and you are ready to go.
Savage is about the only one that you don't have to have a gunsmith put a barrel on (yeah, you can do an AR15 also).
Savage makes a real fine Palma and F/Class rifle ready to go for a real low price. You might call them and see if they will chamber one in .260 Rem, everything else is the same as a .308.