Hi Joe! This round has a subsonic muzzle velocity, so it won't create a little sonic boom when it's fired. I don't think you'll be very satisfied practicing your aim with a shot cartridge, though. Aguila makes some pretty good rimfire ammo, and this round's 40 grain JSP bullet could serve for self-defense if you ever needed it to: luckygunner.com/22-wmr-40-grain-jsp-aguila-50-rounds. This round will make considerably more noise though – it tears the sound barrier in half, which isn't to say the 22 WMR has a very loud report even when it's at full power.
And forgive me if you already know this, but I just want to make sure your revolver isn't chambered for 22 LR. We get a lot of new shooters who mistake 22 WMR for 22 LR, and I don't know how familiar you are with ammo is all!