The original CB round is much older than any of us..Remington may have a copyright on the name " CBee", since that is what they now call their CB rounds. Some of the originals were quiet enough that they were used for "parlor shooting" in the early days of .22RF. Here's a short history on .22 RF, by Chuck Hawks;
http://www.chuckhawks.com/history_rimfire_ammo.htm As far as I know, the original Aguila Colibri is the only one which is fired on primer alone. I am not a Remington rimfire fan for 2 reasons..dirty and and too often, failure to fire. That's just my experience, yours may be different.
CCI has CBs in two lengths..short and long. The longs will function through most repeater magazines, although self-loaders must be hand operated. From my experience the longs and shorts are equal in power and accuracy. It is said that the long, have the same amount of powder and posed closer to the rifling..has the powder all lying on the bottom of the case when fired, while the powder in the shorts stays more where it belongs..thus equalizing the accuracy.
I think that with the new "quiet" round, CCI has developed a new powder which fills the case yet keeps the speed down to a quiet level to CB range (710 fps), yet delivers 40gr punch (45 ft lbs) . Unfortunately, none of the CCIs mentioned are HP bullets..but I wonder just how well even hollowpoints expand in soft tissue at 710 fps.
http://www.cci-ammunition.com/products/detail.aspx?use=3&loadNo=960 One round I have used recently with great results, is the comparatively new Winchester, full 40gr subsonic with a big, gaping, hollowpoint..it is accurate hits like a sledge hammer on woodchucks etc.
http://www.midwayusa.com/product/2900255464/winchester-super-x-ammunition-subsonic-22-long-rifle-40-grain-lead-truncated-cone-hollow-point