Federal makes a #12 shot 22 LR which I prefer over the CCI as it's crimped brass instead of having a plastic cap and I can cycle it safely in my Henry lever. CCI also makes a #12 shot 9mm Luger round (2x payload), I have tried it in my 995, better than the 22 but it has to be hand fed. My favorite short distance, small shot shell round is the #9 shot CCI 45 Colt that I use in a NEF Survivor. Even though it's rifled it also has a choke...great yard / garden round.
Don't underestimate the 22LR #12 shot, I have dispatched trapped nuisance Raccoons with them where I was worried about possible over penetration / ricochets...(i.e., in my attic)