Killed a few whitetail with the T3, mature bucks and doe's.
Killed a mature bull in NM in 2012 with the T3. 67 yards, lung shot, went 40 yards and piled up.
Killed mature deer in Utah in 2012 and again in 2013 with the T3. Spine shot on the buck in 2013 at 65 yards, he went straight down and I followed up with second shot again at 65.
I've had great luck with the T3. Leaves a giant hole in em and does a lot of damage. Knock on wood...I have yet to lose an animal when hit with a T3.
By far best mechanical I have ever used and flies better for me than a fixed blade.
Just my 2 cents