I am honestly saying this, I rarely critique videos of that nature, and I dont dislike the YM, but that video of his was silly.

First off, cycling the same round through a cylinder over and over again is abviously going to crimp jump many different rounds...who actually does that in real life? Few will run 4 rounds through a SD pistol, re-running the 5th over and over again.

He needed to do a single cylinder set test, with accuracy and chronograph info to faithfully see what a certain round will do in each cylinder set.

...and I need to do some homework, but I still think running +P 9mm in such a short barrel is silly...but I may be mistaken.