I'm confused by your question. I'm happy to try and help but we've got to be on the same page in terms of what tuners do. I must be misunderstanding your post because reading group size and shape is 99% of using a tuner...and yes, you have to know what completely in tune looks like. It's just as important, or maybe more so, than knowing what out of tune looks like.how did you pattern tuner while it was in tune?
Tell us what you're thinking of putting a tuner on and how does it shoot now?--Mike Ezell