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I doubt any would even know or check, the target is the only thing that matters, SD & ES has little to no baring on group size/point of impact at all in short range bench rest, rimfire or centrefire...

I haven't had the feed back yet from the benchrest boys & have sold plenty of it, could be the batch ?

The Norma Tac 22 shoots very well, pretty cheap at $12 per box if you know where to get it ;)

Usually the biggest problems with tuning are inconsistent ammo, inconsistent conditions (ie outside) & moving the tuner too much between test groups