The theory is called epicyclic swerve. Litz initially touted this but later disproved it, in his opinion, by shooting thru a whole line of targets out to a considerable range and then measured the groups at each range. Found no evidence to support the old "projectile going to sleep".
However, I know of a top long range shooter in Oz who states (with back up theory) that you should never group test at less than 140 yards. Why 140 yards? Go figure.
https://www.longrangehunting.com/thr...swerve.148380/
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