Doesnt matter a whit what someone else's has done, only what you and yours can do.
The potential for 22 LR accuracy has been definitively worked out quite some time ago. For starters you need a decently bored, reamed and rifled barrel on that solid platform with a very good trigger. Typical sporters will have typical 'field chambers' (and shoot typical non-exceptional groups), not 'match chambers' and you need at least a tight field chamber and preferably match chamber AND the best ammo that the gun likes. Then there is the shooter........some days I seem to be not better than a 3" shooter at 100 and it can be frustrating, so I pull out my trusted Martini International MkIII with 20X scope that is a proven commodity; if I 'miss' its me not the gun (bench, of course, that rig is about 14#). And speaking of bench, it is an art and science all itself.
So, do you have a good heavy solid bench?
What do you use for bags and where?
What do you sit on?
Can you assume the exact same position with the gun on the bags each time?
Can you assume the exact same position for yourself each time
And this, where a lot of guys mess up, can you put that buttstock into your shoulder exactly the same each time?
Do the above with yours, testing ammo until you find one it likes, then buy all of that LOT # you can afford. FWIW, there is wide variation in capabilitie of 22 ammo and it is not unusual to find some that shoots well at 50 and falls apart before 100.
Then start learning about light conditions, mirage and wind effects.