Webley & Scott made a single shot bolt action .22 shotgun. They are quite scarce but I have one. They made them in .410; very common, and 9mm. rim-fire; slightly less so. I use the 9mm. for mink in live cage traps but need to be within 10 feet for kill and preferably less for a certainty. I use the .22 for rats and mice. 15 feet is about max for a medium size rat and 10 for a bigger one. Fiddly little things too load and one has to be careful that the extractor doesn't fall out. Lagopus.....