Hi
I've got a sportster youth in 22 mag as well as a Marlin 25mn and a marlin 922.
They each like a different load. my sportster likes the PMC predator load best of what-all I've tried, that includes the winchester supremes(didn't like), the win. grey box (shoots those OK) remington vmax, win dynapoints three different CCI loads (shoots the CCI maximag 40gn HP OK but not the gold dots or the TNTs).
My gun seems to like 40 grain loads.
If you're shooting at 50 using a non-AO scope paralax may be a factor.
My rifle shoots better with a fouled bore-10 rounds or so.
HTH