Quoted:
And people wonder why Molon really doesn't post here anymore.  Because of asshats that nitpick every single thing he does, and bitch when it isn't exactly what they wanted/expected.  

Typically, Molon eliminates or minimizes as many variable as he can in his testing and just posts the results for people to draw their own conclusions.  
When he does offer opinions, they are based on what he sees in the data and off his expert knowledge of ballistics.  Knowledge he's gained from actually doing shit.  
From what I've seen, he's more than open to suggestions on methods to improve his results and increase the reliability of his findings.  He's even gone so far as to re-test loads when valid points have been raised.  

What is "substantial velocity difference"?  I'm sure it means different things to different people.  What is acceptable to me might not be to you; and is probably way different than what extreme distance shooters would accept.  
Why did he not use M855 or M193?  I don't know for sure, but probably he was using a handload that had a lot more consistency in BC, powder charge, seating depth, etc., etc. as to try and create as much as possible an identical load.  
The purpose of the test, after all, was to measure as closely as possible the actual velocity difference between barrel lengths.  Cutting down on the errors inherent in mass-produced ammunition only makes his results more accurate.  

So no, I don't find it "funny" that he didn't use mil-spec ammo.  
The only thing I find funny is a member of this site who's been around for over 10 years calling out another member who's done more to further the body of ballistics knowledge than 99% of the people on here.