England.
For Muntjac and Chinese Water deer only- a rifle with a minimum calibre of not less than .220 inches and muzzle energy of not less than 1000 foot pounds and a bullet weight of not less than 50 grains may be used.
For all deer of any species - a minimum calibre of .240 and minimum muzzle energy of 1,700 foot pounds is the legal requirement.
Source - BASC - Deer Stalking Code of Practice
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