How to measure the effectiveness of a muzzle brake?

[ChrisP]

I saw a really good article testing brakes a few years back. The guy used a rig similar to a led sled but it was on free rolling casters that were relatively friction free.

He used an ink pen fixed to the sled drawing a line when fired and simply measured the linear travel by measuring the line.
....

Umm, check the videos earlier in the thread )

 

[WildRose]

Umm, check the videos earlier in the thread )

I've looked at several of them.

What is it you think I'm missing?