Good shooting. It sounds like you have a great rifle, and I really like your sights. I much prefer to use five shots when measuring groups, as you seem to. It seems MUCH tougher to get all five shoots to behave than just three. I love trying to shoot consistantly tiny groups with a .22, but consistancy takes dollars, unless you just get lucky with a great economically priced gun and good lots of ammo. I am jealous of those that end up with those combos.
I have always tried to have one 'super grouper' in my small stable of guns. Over the years I have run through a Winchester 52, three Kimbers, two Sakos, one Dakota, a Remington 541-S, one Cooper, and probably some others I can't remember. All could consistently do the MOA thing with high dollar ammo (Ely, Lapua, etc.). Right now I have one Kimber and one heavy barrel Sako Finnfire. The Finnfire has a heavy stainless Lilja barrel and a 2-ounce Jewell trigger on it and is probably the most accurate .22 I have ever owned. If I shoot a five-shot group over .3 inches (50 yards), I am disappointed. The last time I shot the Finnfire was four five-shot groups I fired on my backyard range about a month ago with Lapua Master. The four measured .18, .28, .17, and .19. Tiny groups are FUN!!! And addictive!!
I also have a couple of centerfires that will do the MOA thing with some regularity, but I get a bigger kick out of it with my quiet .22s.
Do I remember my first MOA group? Nope, it was probably decades ago. But I am sure that first small group stared this whole obsession with accurate .22s.