I have no experience with the 6.5mm bore so this is just speculation on what I have read here and other places.......

If you are going to go 6.5mm, I would think about a 6.5x55 Sweede. It can do everything that a 260 can do, and then some. The data on the 6.5x55 is usually "toned down" to keep it safe for use in the older military actions it was originally chambered for. With modern powders and bullets, and used in a stronger modern action (Savage) it is reported to be much more than loading manual data says it is and loads can be worked up safely above the "Book Maximum". The 260 is in right now and is impressive, but it seems to me that the Sweede is capable of more. Plus just a lil' retro-cool factor. I know when I step into the 6.5mm arena there is a strong argument to me to go for the Sweede.

I may be way off base here, but just what I have been reading and looking at. But with no experience personally, all that my rantings + 98 cents get you, is a dollar menu coffee.