I've noticed that some days I can't shoot for schitt even with small cartridges, and that some days I have little-to-no recoil tolerance.
As I've aged I've more frequently run into the some days are better than others phenomenon.
Guys that "EFFECT" or AFFECT shows up in more than shooting.
I've experienced it riding Enduro Trails, MX (motocross), and Hammering Nails... and other things too.
" Some days are diamonds, Some days are stone " ; our mental, physical, & emotional 'states' are not always the same.
Jerry