They are 20 grain at 450 fps, like a pellet gun. I am looking for something like air gun speed and sound level to use around by bee yard. The hive draws mice and the mice attract copperheads. I have a box of shorts but they are still too loud. I think these are like the old cb caps that you used to shoot at the shooting galleries, no powder, just the primer. I imagine they wouldn't work in a semi auto but they should shoot good in my wrangler. I can't seem to find any locally.
22 LR COLIBRI
I use air guns. Here are some penetration tests I did with various .22 rimfire.
Test procedure: 12 inches of Uline catalogs were stacked and put in a cardboard box to test bullet penetration. Catalogs changed every 6 shots or so. The penetration was measured to the rear of the bullet with a 1/8-inch steel probe through the hole. So, the deformed bullet length should be added to the results.
*.22 Rimfire - snubnose 2" barrel.
.22 CB Short 710fps S&W snubnose 2" barrel.
Penetration:1/4"
.22 L.R. Stinger 1640fps S&W snubnose 2" barrel.
Penetration:3/4"
.22 .22 L.R. Remington Golden Bullet HP S&W snubnose 2" barrel.
Penetration:1/2"+
.22 L.R. Target Lead RN 1200 fps S&W snubnose 2" barrel.
Penetration:7/8"
Penetration:7/8"
Notes:Tested 2x
*.22 Rimfire - 3.5" threaded barrel
.22 CB Short 710fps Walther P22 3.5" threaded barrel.
Penetration:11/16"
Notes:Failed to eject
.22 L.R. Subsonic Walther P22 3.5" threaded barrel.
Penetration:3/4"
Notes

irty
.22 L.R. Remington Golden Bullet HP Walther P22 3.5" threaded barrel.
Penetration:5/8"
Penetration:9/16"
Notes:Tested 2x
.22 L.R. Stinger 1640fps Walther P22 3.5" threaded barrel.
Penetration:7/8"
*.22 Rimfire - 18" barrel.
.22 L.R. Stinger Savage Mark II rifle 18" barrel.
Penetration:1-1/2"
.22 L.R. Remington Golden Bullet HP Savage Mark II rifle 18" barrel.
Penetration:1-1/4"
Penetration:1-1/4"
Notes:Tested 2x.
.22 L.R. Target Lead RN 1200 fps Savage Mark II rifle 18" barrel.
Penetration:#1 1-3/8"
Penetration:#2 1-3/8"
Notes:Tested 2x
*.22 WMR - 1-1/2" barrel
.22 WMR 40 grain HP North American Arms derringer 1-1/2" barrel.
Penetration:1-3/16"
For comparison...
*.32 S&W Remington
.32 S&W Remington Lead RN 88 grain 1-7/8" barrel Ruger LCR snubnose.
Penetration:5/8"
*.32 H&R Magnum
.32 H&R Magnum Black Hills 90 grain Lead SWC 1-7/8" barrel Ruger LCR snubnose.
Penetration:3/4"
.32 H&R Magnum Black Hills 85 grain JHP 1-7/8" barrel Ruger LCR snubnose.
Penetration:15/16"