the only options for useful shotshell work on anything really is either a shotgun, or a judge or even a governer using an actual shot shell. however a 22lr rifle loaded with cci or federal shotshells is good.
Well ,everything works within reason ,range of the CCI loaded shotshells is probably 15ft or so , pattern degregation & the size of shot (#9) loose energy fast !!
But the biggest problem I have with the capsules is they slide out & bind the cyl or break & dump the shot load !!!
I form shotshells from 357 MAX brass to be "Full Cyl. Length" in my GPs ,It carrys almost twice the #9 load plus ya got room to go up in shot size ,even though bigger shot will mean sparser patterns the energy of the pellet extends the range somewhat !!!
Here`s a pic of the round sealed with a cereal box card & water proof carpenters glue .
Wanted to add: the snubbies will pattern better than a long barrel, less time to start spinning .