I've been revisiting using a tuner on a rimfire rifle. As I've been shooting at 57 yards (my club's version of 50), I've been wondering about what the tuner should be expected to achieve.
There are a few prerequisites. It's necessary to use consistent ammo and a rifle that can shoot consistently. It's also necessary to use a consistent rifle/rest set up and to use as consistent a hold from shot-to-shot (or to shoot "free recoil" which removes shooter "hold" from the equation).
There are a few "givens" when a tuner is doing what it should. It won't suddenly make poor ammo turn into good shooting stuff. It won't magically shrink groups to sub-.5 MOA (that's under .25" at 50 yards). It won't eliminate "flyers" or errant shots that are ammo related, caused by significant MV differences or imperfect bullet heels or center of gravity issues (balance).
When the best tuner setting is found, what should a tuner be expected to do?
