The T3 will have plenty of tube. I'd not get hung up on 24", although there was a time when I really thought that extra 1.5" or so would do something for me. Then, after a bunch experience I found out how truly little it meant.
Fast tubes, slow tubes, fast lots of powders, slow lots of powders and so on. You get my drift...
Don't think that they make the T3 in a 260 either so I'd still go 25/06 and I would even if they did make the 260.
Best of luck to ya.
Dober
