Aguila's SSS 22 LR is some stout stuff pushes a 60 grain bullet at 950 fps MV, they claim 24 inches of penetration in ballistic gelatin at 200 meters. i like it because its very quiet about as quiet a CB long and they cycle my 10-22's action flawlessly and group very nicely at 50 yards. I never shot anything bigger then a jack rabbit with them but they do the trick nicely.