This thread has reinforced my decision to stop using cheap 22 ammo. I never did like the CCI 22 ammo because it was too destructive on squirrels, which is all I hunt with my old Marlin. I've been using Rem Thunderbolt. However, when I set up my Chrony for testing centerfire rounds, I always run one or two 22 rf rounds over it to check its operation. 90% of those 22 rf Thunderbolts clock right around 1125 fps. But every once in a while one clocks around 800 fps. The retort is a little quieter, but not enough to really notice except for the low Chrony reading giving a headsup. Or is that earsup? Sometimes those squib rounds jam the auto action, and sometimes it cycles just fine. Anyway, I'm buying Winchester 22 ammo from now on--and not the cheapest.