I decided to try 8.1 grains before quitting. I got 1590 fps, suggesting something MIGHT be wrong with the chronograph. The manual says to paint your bullets black on bright days, so I did that. With 8.1 grains, it gave me 1100 fps, or 90 fps SLOWER than 8.0 grains.
No idea what's going on.
At least I didn't get pressure signs.
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