I have a finnlight in both 2506 and .260, for deer sized game both are great, have taken a dozen goats, a pig and two deer in the last ten days, (currently back in New Zealand) with the 2506, not one has taken a step, just down like the hand of god, don't know why, on paper 2506 gets a bit of a beating sum times, but the 2506, seams to do real well, in the field, much better than my experience with .270, .243 and .308, right balance of speed and performance to the size of game (deer, pigs, thar, goats) 50-200kg animals.
I was after a .270, or bigger in a finnlight at the time, but was able to pick up a 25-06 for $1600 Cad, I am very happy with that choice.
Any non mag cal, that can push 2800-3000 with a standard bullet weight, over 100gr is a fine choice in a finnlight, the few magnum I have fired were slappy bastards, with lots of muzzle rise.
wouldn't mind a 9.3x62 in one,
When the .260 finnlight gets to NZ, (currently in a sea can on the way) its booked, for a chop to 16" and a suppressor install, 2506 is a tad to long with a suppressor installed, pain in the ass in the bush,