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Not unsurprising as RWS Match and Norma Tac-22 and RWS Special Match and Norma Match are made by the same company (was Ruag now Beretta) only the headstamps are different.

Excellent, the type of advise needed thanks.

Oh OK I thought you were a knowledgable current user.

I'm aware of all above. And yes I log all atmospherics when shooting 100yd groups and yes I'm aware the tune can change session to session.
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Much as I'd expected https://defensiveedge.net/barrel-tuner-setup-adjustment/

Or at least a decent amount of individual lots of the same ammo. Changing lots, the bane of rimfire, would possible see better or poorer results from the previous lot. Still, that's what we hope the...

Jason in his vid chewed thru I think 100 rounds of Eley Match for no improvement on the Springfield. But that was a lost cause. Hopefully, with a good performing rifle there can be improvements. ...

Ah good. Someone with actual experience. What rifle are you using your tuner on and what brand of tuner?

I bought a Lowey tuner for my LA101 earlier this year. Due to an annoying health issue I haven't had a chance to try it yet. Hopefully will get to the range later this year.
Mine was NZ$212.

So,...