…A 100yrd zero with a 22LR is ~19MOA from optical center (instead of ~4.5 for a centerfire at 100yrds), so a 20moa rail doesn't really and any added scope capacity at all, it just puts the 100yrd zero back to optical center, leaving only HALF of the scope turret capacity available to the shooter.
A 22LR really can benefit from having at LEAST 40MOA in the base and rings, using a scope with 60+ MOA capacity. That puts us very near the top of our turret at 50yrd zero, meaning we can shoot out to ~330-340 before we run out of turret, and can hold over to reach 400yrds if so desired. On my Savage Mark II BSEV, currently I have 60MOA in rail and ring shims under a scope which has 110MOA adjustment capacity, so I have access to ~103moa, meaning I can dial clear out to 500 before I have to start holding, and can hold out to ~550. On my Ruger Charger 22LR, I have a scope with 93MOA capacity and 60moa rail + ring shims, so I am ~1" high at 50yrds in my zero, but I can dial out to the equivalent of 94moa, which gets me to 450 without holding, and about 525 holding in the reticle. But those are rather extreme set ups.
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So put 20MOA or preferably MORE on your 22LR.