I know this is a tad late, but you may find it helpful.
452 American, Weaver 2.5-7X set at about 6X, 50 yds. 77-22, Weaver Rimfire 4X: They don't allow rimfires of any flavor on the 100 yd. and longer ranges.
But I did fire a couple of 100 yd. groups with my 77-22 one day, when the range officer was absent, and the other fellow shooting was agreeable...IIRC, two kinds of ammo...and probably CCI mini mags was one of them. Both ~ 6in. low, and grouped ~2.5 in. It was a windy day, and I was in a bit of a hurry, for obvious reasons. I think I could have done better.
Mini Mag HP 4 rounds, -13/16", 1 flyer, (my fault) opened to 1 3/16". CCI MiniMag solid 3/4". CCI Velocitor, 1 1/16". Aguila Interceptor, 1 7/8",( 77-22, Interceptors, 2".) Win. Power Point 5/8", (?) 77-22, 13/16" but, I am satisfied with that for a hunting round. Blazer el Cheapo solid, unplated... 1". Now to see what my Paco Tool may do with them...
I am the limiting factor, but the results are generally in line with previous sessions, with both the 452 and my 77-22 ...except those Power Points... they are GOOD STUFF.
As you can see, I prefer the plated HP ammo. I have ~15 more brands of ammo to test, to make my final selection, but I don't expect radically different results from my last series of tests. The 452 has a small, but noticeable edge in accuracy over the 77-22, but not enough to feel bad about. They both shoot most of the the same brands very well.
O wait! One thing I forgot. I measure groups using an engineering hole template, and the group size is judged to be the smallest hole the group will fit into...edge to edge. No subtracting half the bullet diameter. Not gnat's nut fine, but plenty good for my purposes. Besides, all those decimals give me a headache!
I will add more results to the post as I am able.