About ten years back I asked the same question regarding Barnes 80 TTSX bullets..
Even after we had milled the blue tips off the Barnes TTSX bullets these projectiles were too long, key-holed at 100yd targets and grouped far better out of a modern Model 14 250 SAV then out of my older 99s with a 1-14 twist.
As for damage on varmint sized game, the 80 grainers were pure murder. I'd show you a pic but it's just a bloody gaping 3" hole in a groundhog.
