Understandable, I did the same thing with mine when I first got good groups out of it, boasting to my friends about my .6 MOA .22. It dawned on me later that I was only shooting at 50 yards so no more bragging. I like shooting it, good training to overcome the flinch, and at 10 cents/round it's still the cheapest gun to shoot that I own. To shoot tight groups with it requires the same skills (to a lesser extent) needed for centerfire rifles.
Mine falls on its face at 100 yards, mostly vertical spread because of MV variation, I suspect.
After I installed a scope with adjustable parallax I shot some of the SK ammo and printed at least one .5" group but I need to shoot a bunch more before I declare it 1 MOA. It will be fun trying. I just installed an S&B PMII on it (10m close focus) where it will stay until I have my next build done. Overkill...