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Kachok says the tightest groups he has ever shot have all been behind his 6.5x55.
To which I say, a cartridge or rifle's accuracy is best defined by the size of the loosest (largest) groups shot. Any rifle-ammo combination will shoot a very tiny group once in a (great) while. And virtually all of the time, they'll shoot better than the biggest group shot. I boils down to what you want to count on; what happens a small percentage of the time or near 100%.
Given two rifle and ammo systems with equal accuracy levels, one with 20 foot-pounds of recoil energy and the other with 10, one shooting both the same way off their shoulder will get best results with the lighter-recoiling one. This is why the folks producing the best scores in long range prone matches switched to the 6.5x284 and quit using 28 and 30 caliber belted magnums. But that didn't happen until really great quality 26 caliber match bullets were available.
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