I have the SAW 2 chamber and get 2790 in a 24" barrel … so close to what they advertised in velocity. But my AI I get 2910 in my 26" barrel, but it is on a XM action and not loaded hot with Varget.Thanks! Considering building one with an 18" barrel. I think with that barrel length I wouldn't have the velocity to take advantage of the heavier longer bullets.