Originally Posted by buttstock
This video may have some relevance to this thread. Some....perhaps...

A shooter tests penetration of 4 various Winchester factory loaded cartridges into 10 lined-up 1 gallon water jugs.

30-30 170 grain Power Point
308 Win 180 grain Winchester Power Point
30-06 180 grain |Win Power Point
300 Win Mag 180 grain Power Point

Which one had the most penetration? ( = "best blood trail"?).

Guess before you watch.
https://www.youtube.com/watch?v=VlzKM8VSRqc


SIZE of the exit hole matters for a blood trail.

Penetration ain't all that iffn you don't have expansion