Tuners work...full stop... especially on a rimfire....but you need to understand them
On a centrefire you need good flags & an extremely accurate (sub 1/8 moa capable) rifle to decipher what's going on, otherwise IMHO you are wasting your time at short range let alone long range
Shooting a proper benchrest 22LR at 50 meters with 4 good flags is the most humbling thing you can ever do with a rifle, hero to zero in a nano second & you won't even know why![]()
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