Thanks, I have 6 or 12,000 rounds of highs velocity 22LR for my Kel-Tec so I will need to get some slow speed for this.
My buddy has a can on his Ruger 10/22, and we are often the only people on the range so it will be fun to run without ears covered for a test
And he's mentioned how much of a pita it is to clean the can, so I will be prepared.
Thanks again!
The speed of sound is temperature dependent. In summer, the CCI SV will work fine, in winter you will get a slight crack.
You can buy a selection of subsonic ammo and chrono them, but the slower it gets, it may not make the 10/22 action cycle. The closer you get to 1000 fps, the ifyer it gets. 1040-1050 fps is the sweet spot. I bought a case of Aguila subs one time and found that out.

They get used in the bolt action.
And CCI SV* and SS are the same ammo. Yeah, I know the box says 1070fps for the SV and 1050 for the subs. Chrono it and see for yourself. The only difference is the subs are HP and cost more. The CCI segmented subsonic is devastating on squirrels...as long as you're not wanting to eat what's left.
The powder coated CCI HV and SS does a good job of keeping the lead plasma from building up in the can, but is a little less accurate, and of course costs more.
Don't say anything to your shooting bud and let him witness the first cleaning. You might wangle a free lunch for divulging the secret.
* CCI SV is the reference ammo we try to get peeps to bring to silencer test days at NFATalk. It is the most consistent and accurate of the non-match type ammos. In fact, CCI has stated that their Green Tag match ammo is really selected lots of SV that exhibit exceptional accuracy in post production QA testing.
Same for Gemtech SS ammo. Gemtech is also in ID and has CCI make the ammo. My 10/22 loves it. Slightly heavier 42gr. bullet too.