Re: Ok guys..........I know this has been covered but........
I don't know about the 168 or 180 but the 6.5mm 140 worked well for me on a doe in Wyoming last year. Massive tissue disruption. I think they may be better suited for longer ranges because of their fragile jacket, but I haven't shot big game close with them yet to tell for sure. My doe was at 1030 yards.
If it's not far, it's boring.