Get a HW30S in .22 calibre, deburr and polish, fit with tinbum guides and you'll get 9 fpe with Hobby pellets. Blisteringly accurate and great fun, light as a feather.
Then you can hunt rats and plink all day without going near a pump or a bottle.
Use the change to take SWMBO out for a night out.
https://www.youtube.com/watch?v=EG9YXwsW9-A