I own both, .308 & .260
Both in McMillan A3's. Another .223 is being built as I type this in another A3 (yes I have a McMA3 fetish)
For comps that are not caliber specific I will always shoot the .260

Whatever my dope for wind is on the .308 I have in the past used just less than half value for my .260.
My come-ups are less also.

As far as the claim that the .260 kicks less then a .308.......I personally can't tell the differance between either of mine.

Not sure if you can read what my load is so I'll post it:

Remington RP brass
Primer pocket cleaned
Primer hole cleaned
Inside & outside neck chamfered
CCI BR 2 primers
41.7 gr. of H4350
Sierra 142 BTHP
Loaded to 2.820

This load is a work up that I have done that works extremely well in rifle.
Caution: work up to this load and check for pressures in your stick.

I'm not sure that reloading a .260 is any easier than ________ but it's pretty straight foreward.

FWIW,
Stu