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I’m not convinced that’s a realistic assumption. Shooting groups at 100 yards with all load increments where trajectory differences are negligible would reveal that the precision of the various increments is often inconsistent enough so as to be comparable with the dispersion in the trajectory between increments at longer distance.
Yes, the signal gets lost in the noise as they say…hence as described by Audette, he shot at 300 yards to boost the signal and shot prone off a front bag, with a scope (even though the end use was irons for competition), during the early morning when the wind was calmest to reduce the noise.

Curious what the results of your testing was like?