Another auto trickler vote. A quick point is that should you ever have issues Adam is quick to get back to you(emailed me back within 12 hours). Other than the power conditioner wisely suggested earlier I would recommend the area 419 powder hopper as well.
I am just curious. Would this double blind test involve just velocity figures or would it involve accuracy? There are so many variables involved with actually hitting the paper in the same hole each time I don’t know that you would ever be able to get a statistically significant number with respect to charge weight when so many other factors like barrel harmonics and length in addition to whether you are in the middle of an accuracy node or at the edge. With the cost of components for reloading right now, at a minimum I would say it would be very expensive and I would expect the naysayers to continue to doubt any sort of results.
Now that I have been reloading rifle bullets for almost 60 years, it wasn't until I tried hitting a 36" target at 3534 yards I realized how much a half grain difference in powder load affected the shot consistency in accuracy. I will emphatically state that any minuscule deviation in powder loaded into a bullet casing causes a different point of impact that becomes more noticeable at longer distances. The most important single item in long range accuracy is the consistency of powder in your loads in my book. Yes, the A&D FX120i is not inexpensive but it is the best tool I have ever had sitting on my reloading bench.