Since You didn't mention , if You are looking for a single or multishot pistol , I'd recommend a Ruggles style underhammer pistol in .31 , absolutely PC !
Personaly , I shoot a such one even in contest . Being a buggy gun , I never tried it with its detachable stock .
The tiny RB accelerates with its 6,5 gr Swiss 1 to astoningly high speed , the bullets in the bullet trap look like round stamps , I think , the energy would be sufficient for even bigger critters !
Unfortunately , there are no such made today , but a good tinkerer or mechanic should be able , to build one , it's not too hard .
Including this one , I've already made over a dozen similar pistols for shooting buddies , who even shoot them at World Championships !
I use discarded .308 supermatch barrels , with a thin patch , spit and a .290 RB , these work out pretty fine !
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This is the target which I shot last Sunday feehand at 50m ...
If You need help for such a project , feel free to contact me !
Rgds , enfield