Pigeon shooting
PETER THEOBALD
I draw the line at two machines, if only because of the logistics (not to mention the expense) of lugging more gear out to the hide.

I cannot think of any situation where more than two would be beneficial, particularly as pigeons are becoming more wary of these machines as it is.

If anything, I try to rely on them even less, going back to old fashioned fieldcraft, whenever I can.