Every countryman knows ' If you see a lot of Crows together their Rooks' &' If you see two Rooks together their Crows' .In general the young Rooks where shot in quite tall trees in Springtime to thin out but to the delight of some Gormet's who enjoyed Rook Pie. Rook rifles tended to be small bore the idea being just enough to hit the Rooks but not being able to go far & cause damage since they where often shot in the middle of villages (I used to use a Webley 22 air rifle ) but the' Rook & Rabbit' rifles where the smallest rifles in UK use . Think of a 22 short sort of capacity ,or squirrel rifle. Cant say I ever heard of the OPs gun for Rooks but knocking off sleeping Pheasants that I can see . Keepers hated Guy Fawkes time as they likley took a gunshot for the fireworks about & sneeky Poachers knew it . The Crow isn' t a Rook the Rook is rather dull plumage and flocks gregariously while the Crow has much more colour variation bigger and nests in pairs some times in an old magpies nest . Both have a keen understanding of the ballistics of the common 12 bore load but we unlike modern folk can slip a ball in that upsets their reckonings but is mostly a futile guesture & to be remembering what goes up must come down ..
Rudyard