While I agree about the inner dia of the suppressors being as close to the pellet caliber as possible,
when it came time to order my RONIN, I went with a .25 cal version even though it was going on .22 cal rifles..
Why? Only because I planned on getting a few .25 cal setups also, so, I figured I'd kill a few birds with one stone..
When I threw the .25 RONIN on my .22 Gladius, .22 Puncher Breaker, and .22 Nemesis, I still noticed a Considerable difference!
Sound levels most definitely dropped. I'm shooting indoors, and was used to loud shots and echos in the room.. Not anymore..
The Nemesis is going to be converted to .25 soon, so I can still use the RONIN on it - Though I grabbed an EMPEROR V3 .25 version just in case..
Now, both suppressors will work with all of my rifles now and in the future, as I really don't plan on going above .25 cal. [Yet]
I'll definitely have to compare the Emperor mod on the Nemesis in both .22 and .25 cal to see if I can detect a noticeable difference..
[By ear, as I don't have a DB meter on hand]
Sam -