They had to be snared, shooting wasn't an option, one shot would have alerted the keepers and would have chased the birds back onto the moor and had the farmer or crofter been caught they'd have lost their tenancy and their livelihood.
They were snared in the years when there were huge numbers, my old boy told me that by late afternoon mid September the stooks would be black with them and a bag of fifty or sixty could be taken, lifted under the cover of darkness.
Just another example of the efficiency of the snare!
Cheers.