Why must you have a .260?
I have had one and many other chamberings over the last 60 years and to a great extent they overlap in effect.
What does not 'overlap' or get easy is if the cartridge is not popular.
Even if you handload it will still not be as easy.
The 260 is sort of in the middle. Too big for varmints and too small for really tough game.
Similar rounds that make more sense and will do the same thing are the 7-08, 7X57, 308 and others.
The 260 is not more accurate or less accurate than other cartridges.
They all have the same potential.
Good luck and keep shooting!