That is a real thing. Here is a video proving this.
https://www.youtube.com/watch?v=lR_oshbhII8
Of course that was 9mm, but it follows the same logic. For 223 I don’t believe any velocity would be lost at 26”. Yes, your Axis should be 22”. You did not give us the velocities you were seeing. I do believe you will pick up a decent bit from 22” to 26” Normally, I’ve seen about 50FPS+ from 16”-18” and 18”-20”. Roughly 25FPS/inch. I believe you’d see that in on your chrono, which would give you another 100fps from your 22”.
Velocity doesn’t always adhere to what is written though. Your gun, your barrel, your chamber, etc, etc.. Your chamber might have higher tolerances causing less chamber pressures. This can account for lower velocities among other guesses. Ya know? So, what was your velocity?
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