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It isn't so much that the .260 is "flatter" than the .308 (flatter being mostly irrelevant to benchrest shooters, who can compensate for whatever drop they need to, given that the exact range to target is known), but that .260 bullets generally have a higher BC than 7.62mm bullets and therefore remain supersonic farther downrange based on the case capacities of the respective cartridges. The longer a bullet remains supersonic, the higher its accuracy potential at that range.
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