Remington made a smooth bore rifle, called the routledge, worth quite a bit.
I have shot a lot of small critters , slimey things and bugs, with the .22 LR shot.
Never had a smooth bore however and the pattern sucked.
You have to be really close to do much damage.
I picked up a Marlin smooth bore garden gun a few years ago in .22 Mag. Marlin dropped them a while ago. The .22 mag with CCI shotshells is much more potent than the LR.