Back when I first moved to Alaska I met a gun who made a dern good living in the Minto Flats area of the Tanana River.
Most of his take was shooting muskrats. During late spring is was daylight all night long and he would paddle around the flats and swamps shooting the 'rats.
He used nothing but 22 shorts. Less damage to the pelts.
They use to use (I think the rules changed now) 22 shorts for International Rapid fire matches. 22 LR had too much recoil.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071