If TMK's actually will expend on game, the 1 in 7" barrel would be the place to shoot them. I got a doe with it last year, using 65gr SGK's, so I may use it again.
They'll expand, but maybe too much. Compared to the 65gr GK (which I really like) they seem a bit more explosive.
These were fired into water-filled milk jugs from a 16" barrel, with the penetration listed below: 62gr TSX - 3 jugs 65gr SGK - 2-1/2 jugs 69gr TMK - 1-1/2 jugs
This is a 65gr SGK, recovered from a spike buck (I said doe incorrectly earlier). About 80 yards, the shot broke the onside humerous, gouged a chunk out of the heart, and stopped in the offside hide, with the jacket & core separated, but together. The final weight is 27.6 gr. The buck only went about 30 yards & piled up.