Thomas, good luck with your testing. I'm almost sure you will not find enough difference to make it worthwhile as on ongoing thing. Unless you are involved in very high level precision BR competition. I'll offer one suggestion that I learned doing a lot of different kind of sorting and testing. Meaningful results require consistent conditions, and a large sample. If you shoot two or three groups and reach a conclusion, it's probably wrong, or, at least unfinished. I once culled out a certain lot of Eley RF ammo based on test groups. But, I had taken a short cut and failed to clean the barrel to start fresh with that lot. I cleaned the barrel, planning on next testing some Lapua ammo, so I wanted all the Eley lube out of the barrel. Then, for no real reason I tested the ammo I had culled out, and it shot great. I'm not saying it won't be worth your time, but it's a process that requires patience. Ultimately, you have to be sure that the ammo/pellet is the only variable that changes, and that's difficult.
Ed