22short are being favored by me. Straight outta the box the hollow points don't want to expand. It seems during manufacturing the nose of the bullet gets dented up. Opening them up with a nail tip or an X from a razor blade makes them pop a milk jug and then lodge into a few layers of cardboard. You may prefer 22short round nose, ball ammo. 22short ball ammo punches straight through 2 milk jugs and my 16 layer cardboard bullet catch I use for rimfire tests. The handgrip magazine holds six 22shorts or CB rounds.
22 short. Could be bad for your health. My lifecard chrnos at 860fps to 930fps with cci hollow points over 7 shots.
Tried the lifecard with a bowers bitty on it. Its not as quiet as the 6 inch long cone baffle silencer but it works pretty good. Good enough for pest elimination. I put the 6 inch long cone baffle one back on my semiautomatic pistol where it belongs, where I'm prioritizing quietness. I'm thinking the bowers bitty is a great match for when you want to go as small as possible or if you already have a fairly quiet 22 setup and want to make it quiter, like a 18 inch plus barrel firing subsonics. I'm thinking on a 22 pistol firing full power LR ammo it will be meh. Edit: it's already on a pistol duha. All I needed to do was pop in a silvertip and bang. Its kinda loud. Its about as loud as my monocore gm22.