Okay, it's back, or at least enough for me to take hunting next week.
I changed two things (bore cleaning and switch back to Barnes TTSX bullets) at the same time so I don't know what did it. When I get back, I'll have a gunsmith make sure my Timney trigger isn't touching anything, and try the Hornady Interbonds again.
My groups today:
7/8 inch
3/4 inch
one single hole, so let's say 1/16th inch
7/8 inch
