Winchester Ammunition Introduces Low Noise .22 Long Rimfire Cartridge

Winchester Ammo 22

If you are looking for a quiet 22 rimfire round, consider the Winchester SUPER-X CB-Match round.  Winchester Ammunition introduced the .22 Long rimfire cartridge in 2008.  The round is designed for high accuracy and very low noise.

The SUPER-X CB-match .22 Long round pushes a 29 grain bullet at a relatively slow 770 fps from a 24″ barrel.  From a 6″ barrel, Winchester states the muzzle velocity is a paltry 575 fps.  Expect even less velocity from a handgun like the Walther P22 (3.4″ barrel) or Ruger SR22 (3.5″ barrel.)

This round matched to a gun with a sound suppressor, and this should be a very quiet shooting round.

I would expect that this round would be reliable in only bolt-action and single-shot firearms. Running it in a semi-auto pistol or rifle may not work well, as the load probably doesn’t generate enough force to reliably operate the gun’s action. Of course, I could be wrong, and if anyone has any luck running this in a semi-auto gun, please sound off in the comments section below.

The ammo comes in 50-round boxes and 3000-round cases. I imagine a lot of people will buy this a the case level for fun plinking and varmint control. The 20-30 ft-lbs of energy this load generates should be plenty for rats and other such critters. I would also suggest this could make for a great first round for kids learning to shoot. The noise and recoil would be minimal and easy for kids to manage.

Winchester Ammunition is not the only company that makes a rimfire round designed for a reduced sound signature.  CCI makes several .22 LR loads in the Quiet 22 line.  These cartridges use a 40 grain bullet (round nose or segmented hollow point) traveling at 710 fps.  I do not have any information on what barrel length the velocity was measured from.

The CCI Quiet 22 claims a 75% reduction in noise.  Additionally, CCI claims shooters do not need hearing protection when using that ammo.

By Richard Johnson

Richard Johnson is a gun writer, amateur historian and - most importantly - a dad. He's done a lot of silly things in his life, but quitting police work to follow his passion of writing about guns was one of the smartest things he ever did. He founded this site and continues to manage its operation.