I've used the 80 TTSX in my 257 Roberts. Chronographed at 3400+ fps. I shot a 150 lb buck just behind the shoulder quartering away from me at 125 yrds. Shot placement was good. The deer deer staggered at the shot walked a few feet laid down and expired about 4 minutes later. There was not exit but I did not recover the bullet. After that experience, I abandoned the 80 gr and went to the 100 gr TTSX as I like to full penetration. So far so good with the 100 gr.

The 80 gr was accurate (1.5" @ 200 yd), very low recoil and fast. I would be concerned using it on a heavier animal though. I know one deer does not give much information.

Hope this helps.

I am guilty of punching shoulders most times, was hard to break me of that when I started bowhunting and now it is hard for me to remember, behind shoulder with an arrow and in shoulder with a bullet.