mine get whatever is about, rabbits, pigeon, jackdaws, love mice, eggs, chicken wings, dried food, DAF frozen food and they do like a bit of leftover roast chicken on a Sunday!
Had plenty of nips but a jill bit me full on between the thumb and index finger, right in the meat when I was about 16. took some shifting and brought tears to the eyes! Mates pissed themselves!
Some are finicky twats, mine will not eat crows but jackdaws are ok, they bury chicken wings rather than eat them and mice seem to be their favourite of all, go wild for them "killing" them though they are already dead!
Had a Howa Varmint 308 that I had cut from 24" to 18" as it was a pain in the arse with a mod on stalking, shot it out to 400 on the range and deer fell over ok too, if you reload any loss on fps can be made up.
kept bull breeds for 30 years and never understand lads on a hunting site being interested in them, mine have caught the odd rabbit etc but there are far better dogs for working, you do not get the gundog lads asking about them so why the interest?
I would be more inclined to get the barrel chopped to 12" if I wanted a handy .22, the write up in the shooting times said the zero did alter after taking it down too.