I can't help but notice that with the V-max on the 4th it says 50yds on the 18th 100yds might explain the larger groups
I must comment on your loads for the 45gn 12.2gn - 13gn lil-gun
My book says 7.1gn - 8.9gn lil-gun with the 45gn Sierra
& happy to rehome any spare 40gn