I've worked with just about any cartridge you can think of, but the 260 Rem. isn't one of them unfortunately.
I hunt strictly handguns, which includes the TC Encore/Contender, and the Savage Striker.
My one Striker is chambered in the 7mm-08, and due to the velocity difference between the 15" barrel and rifle lengths, I load rounds that will perform the same (or similar) as do the higher velocity rifle loads which use heavier bullet weights.
Using a Nosler 120gr Ballistic tip and Varget, I get 2750fps with groups at an inch or less at 100yds.
I neck down Federal .308 Match brass to 7mm, and the round itself is just inherently accurate as it's not overbore. Meaning that it's powdercharge/case dimensions are more in relation to it's bore size. Much the reason the .308 operates as accurately as it does.....even more so with the 7mm08.

I know folks who take deer with the .22-250 in Encores, so I don't doubt the utility of the 260 Rem either.

My 2
Take care,
Bob