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Suppressors Velocity question....

i've had as much as 40fps. sometimes people are using percieved velocity from trajectory validation and i think their dope is simply "better" to a degree from barrel timing change or oscillation changes. thats my .02
 
I tend to see more "can boost" on my shorter barreled guns.
My 18" tight bored Bartlein 308 sees a chronographed 50 fps increase with a surefire can, while my GAP 10 with a 20" barrel sees about 25 with the same can.
I even get a little boost on my MK18 with the AAC can.

My AI 6.5CM 24" sees about 16 fps increase average from my TBAC 30P.

All measured with Ohler 35P across several lots of ammo.

As always, YMMV

Sean