I know how harmonics can change your group size and whatnot, but can loosening your FH cause this? I took the rifle I used for the MOA challenge to the range yesterday with some ammo I loaded up - took my time with this batch of ammo, did more case prep than usual, etc., trying to get a super consistent load to re-shoot the challenge. I also loosened the FH a bit, because I wanted to try my Form 1 can on the rifle and I wanted to be able to get the FH off at the range.
For reference, when I did the MOA thing before my average group size was .82 MOA or something like that, so the rifle is capable. This time, I couldn't get anything under an inch, and I was having stray rounds all over the target. The FH wasn't that loose; I still needed a wrench to spin it off. But that was the only difference (other than the case prep). Same load data and everything.
So can just changing the torque on the flash hider cause this?