Testing rimfire ammunition for accuracy tends to be an exercise in frustration. You will find the specific firearms have specific preferences that have no rhyme or reason. That type of testing is fun. The frustration comes in lot-to-lot variations. One lot will shoot great and one lot not so much. High level competitors will purchase large quantities of specific lots once they find one that they like. Places that sell higher end target ammo sell sorted by lots. When Champions Shooters Supply was around they would sell sample packs of various lots. Standard velocity 22 is thought to have the accuracy edge but some HV shooters superbly.
Even some to the firearms general preference defy logic. I have a Ruger 77/22 that is an average to below average shooter unless you shoot Eley Ten X or Winchester Wildcat HV. Winchester Wildcat HV generally doesn't shoot well in anything?????? but that rifle loves it.
https://www.rimfirecentral.com/threa...tency.1207053/
https://eley.co.uk/find-the-perfect-...-lot-analyser/
https://forum.accurateshooter.com/th...upply.3990144/