well, they will NOT hurt your revolver, although you may be disapointed with the results.....
there are guns long and short that have smoothbore .22 barrels that pattern reasonably well, however the rifling in your tube will impart some spin to the shot charge (even though it's encapsulated) and produce open patterns, usually donut shaped....
I have shot some rifled .22's that gave acceptable patterns to maybe 12-15 feet....
The shot size is very small #11 or #12 and small shot loses its energy quickly.....
It's fun to try though, and cheap enough to experiment with a bit..... :wink: