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More likely 9mm though
Way overpowered for small birds, and I don't think there's anything chambered in 9mm which would be legal for a UK civilian to own. If you want to use expensive ammo to explode them, a zippy little centrefire rifle cartridge like .22-250 should do
https://www.youtube.com/watch?v=K6CaflIcEDA
Ruger 10/22 is probably the best combination of cheap, reliable and effective