I've got the T-3 in .300 Win Mag - it'sa great gun, shoots awesome groups, and isn't much to carry around the woods. Personally, I've never shot a different
gun in .300 Win Mag, so I can't compare it to anything, but it wasn't too bad. *shrug*
Only used it on one doe, but boy did it do the job.
It's waiting patiently for that elk hunt in a year or so...