Originally Posted by
DoubleBuck
HighUintas; glad to see you got to test some, anyway! I had a lot of errors and shots that weren't recorded correctly, when I first bought my chronograph. I think I found out that it was reading a bullet and then reading, or trying to read, the patch. I saw where the patches were mainly falling, and moved it back toward the table, and it has done well, at about 11 feet from the muzzle. I, like you, have decided that ten shot groups may give a little more information, but your rifle seems to shoot better than mine, too. Or, you're just a better shot. I have started shading my chrono eyes, all the time. Again, I think you are right, that the bright light seems to just not read correctly. I used a tee shirt stretched across the shades, on mine and it worked great, with a rock on each one, to weight it down. haha. One point late in the afternoon, I used the chrono box, to shade them.
Other than the oddball speeds on the cedar, it looks like you are dialed in on consistent speeds. The top pic. shows a deviation of just 20 fps, on four shots. I'd say that is pretty decent, for sure. And, your groups are pretty fine, too.
It looks like any one of the powders would work, in a pinch!
BTW, what does 'comp 0.075, or 0.080' mean? Thanks for posting your results! It looks like you're on your way, for sure!