CCI makes CB Longs, and CB Shorts. Both run at 710 FPS and are identiacal in every way except the length of the case. One is a log rifle case and the other is a short case. Both are pushing the same bullet and both only use the priming charge.
CB longs will not foul a Long rifle chamber as they go in just as far as a LR.
During the "rid raccons" thread all of this was discussed in excrusiating detail and I went out and bought every kind of ammo talked about.
The CCI stuff is by far the best.
I had one round, the Aguila 525 fps CB cap which was very quiet but would only penetrate a 2x4 about to the base of the bullet. All of my pellet guns will out do that so nothing good there.
CCI is the best for sure. the longer the barrel the quieter it is.
That was my entire .02 on this subject. Been there done that, never even got to shoot a ****! But I'm well stocked on .22 ammo