Kevin,I would agree for the most part but I think it's due to climatic conditions, I used to live closer to Denver and shot at an underground 100yd range when testing rimfires, shot some pretty amazing groups with select lots of R100 and Tenex in my 40x. I had one carton of R100 that produced centerfire like groups, I don't remember exactly but they were under .5" for 10 shots groups....if I remember right.
It was an anomaly though, a good lot of Tenex was between 1/2 and 3/4.
Speaking of Tenex the last two cartons I've gotten were terrible, had better luck with Edge
and..... have you noticed the prices have went down finally. Yay!!! hope they get back to where they were 10 years ago.
My context in responding to and agreeing with Jack, is that I have shot some 50 yard 22 rimfire groups (all my shooting is outdoors) under .100" (not many!) and quite a few between .100" and .200", but I've never come close to shooting a .200" (double?) rimfire group at 100 yards. I'm sure shooting in a tunnel or the Texas warehouse would have a significant positive influence.