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All those tiny few to several shot groups at any range are mostly luck. They happen when all the variables tend to cancel each other out and the shooter dopes the wind very well. When all those uncontrolled variables add up, the groups are larger; much larger. Rarely, if ever, does a record holding barrel shoot another group smaller; they all are larger.
The best long range rifles' accuracy is, they'll keep all shots under 7 to 8 inches in a no-wind condition. Check out the many-group aggregates' average then add 50%. That's typically the size of the biggest groups' shot. Benchresters are sticklers for not making it public information as to the largest groups shot. With these aggregate's average in the 4 to 5 inch range, that means some of their groups were in the 6 to 7 inch range; maybe bigger.
Therefore, I'm not all that impressed by those record-setting tiny, rare, once in a lifetime of the barrel, groups at any range. They're a statistical issue; there's always one data point at the tiny end of the performance spectrum.
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