I would like to know if anyone has tested this. A cr600w rifle in .22 cal. anyone knows the fps it can give for 14.3 grain pellets? i don't have a chronograph but i don't see videos of the rifle and it's fps doesn't really specify what grain pellets it gives. sometimes i see 560-550-500 fps advertised and i don't really know which one is correct. is that even too much low power?