Your standard for good ammo is a lot different from mines. I would not call a lot that did 15mm good.
Lee
You must have a cut-off somewhere between 12 and 15mm for the difference between a very good lot and one that's just good. What is it -- one or two millimeters more than 12?Very true it is not how small but how often. even with the mentioned rifles I still would not consider 15mm good especially if you are testing Lapua.
Lee
As an observation, if all shooters held out for lots that produced consistent ten shot groups no more than 12mm outside-to-outside, there would be few doing any shooting. Accepting 15mm oto performance might not be a bad thing.