With mechanical rimfire barrel tuners, those such as the commonly used Harrell tuner move the tuner weight by increments of .001" at a time. That is to say, the tuner has 500 clicks or increments of movement to move the weight half-an-inch. While there often are more than one tuner setting that show some improvement in results, there is only one optimal or best setting.
Tuners that move it's moveable weight over a similar or greater distance but in fewer increments may not be able to achieve the barrel's "best" tune. In other words, if the tuner weight moves .05" or .1" per increment (click), it may not be sufficiently precise.
Shooters considering the use of a tuner should be cautioned that finding that best setting may not always be easy or straightforward. I can confirm that from my own experience using several different kinds of tuners with several different rifles.
A very experienced, serious, and respected BR shooter, who posts on many forums and does extensive testing in his own testing tunnel, offered this observation a few years ago about how difficult it can be to tune a rimfire rifle, even when using "good" ammo:
"I've never found it as easy to tune a RF rifle as most would suggest it is. Fact is, I've yet to test a rifle in my ballistic tunnel that was truly tuned even when someone brings a rifle and is convinced it's tuned."
See post #41 here https://www.rimfirecentral.com/threads/50-at-200.1129343/page-3#post-11089975
Tuners that move it's moveable weight over a similar or greater distance but in fewer increments may not be able to achieve the barrel's "best" tune. In other words, if the tuner weight moves .05" or .1" per increment (click), it may not be sufficiently precise.
Shooters considering the use of a tuner should be cautioned that finding that best setting may not always be easy or straightforward. I can confirm that from my own experience using several different kinds of tuners with several different rifles.
A very experienced, serious, and respected BR shooter, who posts on many forums and does extensive testing in his own testing tunnel, offered this observation a few years ago about how difficult it can be to tune a rimfire rifle, even when using "good" ammo:
"I've never found it as easy to tune a RF rifle as most would suggest it is. Fact is, I've yet to test a rifle in my ballistic tunnel that was truly tuned even when someone brings a rifle and is convinced it's tuned."
See post #41 here https://www.rimfirecentral.com/threads/50-at-200.1129343/page-3#post-11089975
