The above was in relation to an older film I watched on culling a herd from a chopper.
The cows had formed up a protective ring with the calves and the shooter just dropped them one after the other with single shots from above.

Although I have no qualms about knocking animals the film was somewhat disturbing. The E cows trumpeting and screaming with no hope of protecting their young,old matriarchs of many a year just dropping like flies.

I believe from memories long ago a bolt was used.