Depends who the hunter is, what the game is, what the whole scenario is.

We culled something like 20 buffalo in 60 seconds, both using 375H&H's.

1 cow and 2 calves / younger one's at the front of the mob got away. Mate went over the flood plain, 10 minutes later, 3 quick shots and he came back.

Went over later to get the meat, 3 head shots with a 6mm or 6.5 at close range while they family group stood still in some brush.

Now I wouldn't have done it then (I might now with more experience) but he is more than capable of doing it.

So more info needed IMHO.