Recently I was given a couple .22 pistols. One was a H&R "Young American" 7 shot, the other was a H&A "XL Double action". I have read that these guns were Rimfire Black Powder. Both could be shooters, I don't want to damage either gun, they are very poor appearance, but after cleaning dry fire okay.
Would 22 short be usable, or should I find or make 22BP.
My concern with an older gun would be how tight the cylinder lockup is.
I think the test is, **** the hammer, pull the trigger, USE YOUR THUMB TO BRING THE HAMMER DOWN SLOWLY AND CAREFULLY, keep the trigger pulled and check to see if you can rotate the cylinder.
If you have play, its probably unsafe to shoot.
What can happen with a loose cylinder lock up is half the bullet could land back in your face as it ricochets off the edge of the frame.
rounds are still being made.
There are also very low power "quiet"
rounds. The weakest of which is Aguila Colibri
20 grain bullet and (apparently) only primer powder in the rim. Extremely low powered and quiet. I think MV from the guns you mentioned would be 300 fps or less.