Something happened and I had a wandering zero. When I mounted the Talley rings I didn't degrease or loctite, so I figured it was just a matter of time. One shooting session the gun was shooting about an inch low. The next session, it was an inch left.
I took the opportunity to change rings to Sportsmatch T084 rings, degreased and nail polished all the action and scope ring screws and established a 5 shot zero just in time for the CBC. I got out today and shot a couple of ten round groups.
The top group is ADI 69 grain SMK. The bottom is AAC 77 grain TMK. I think I'll adjust U.1 and L.1. Hopefully, I won't have to change anything for a while.