Nosler .260 brass has a 2.015 OAL, is that a problem?

Not an expert by any means, but I would say no. Just load them to your regular OAL, and you shouldn't have problems. I trim all my 260 brass to 2.020, so I doubt .005 is going to make that much of a difference.
 
seems short... (I don't use .308 win brass in my .260 just for that reason.... it's too short).

I'd verify with nosler. My once fired Lupua measures @ 2.028"