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Are the groups repeatable and not showing any of the 'group diagnosis' patterns?

Yeah, the Lapua and Eley offerings I was using don't seem to be available now or have changed from what was the norm so aren't a worthwhile starting place (only have a few packets of each left for...

I'm not now, but was when I was doing rimfire target. To be fair, there are several methods for 'tuning' or twitching the resonance of the barrel - the muzzle device is but one. Others include...

Yeah, they won't fix fooked.

But, if you have a brand of ammo that is producing nice circular reliable groups that are bigger than you'd think it should - that's a good candidate for tuning. ...