Not happy with bullet performance.

[thinkingman]

I would agree that the velocity and angle you chose to shoot is more to blame than the bullet.
Call Barnes and ask them what they think.
Personally, I think small deer are too light-skinned and boned to get good performance out of a TSX, especially at that velocity.
I think bigger-bodied game would get more expansion and absorb more energy.

[bobcat]

I agree with Rick's thoughts as well. If you want to try a different bullet, go with another pure copper bullet like the Nosler etip. I don't quite understand why you say you got poor performance from the Barnes bullet. At the velocities you're talking about, going to a softer bullet doesn't make sense. I believe Hornady now has an all-copper bullet as well that might be worth a try.

[high country]

Fwiw, you mentioned the mrx.....not an all copper bullet.

Call john lazzaroni and ask him. I bet a partition type with a positive stop to limit expansion is as soft as he would suggest for close shots on big stuff.