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I have also published articles and book chapters about the problem with making accuracy judgments on 3-shot groups. Among other things, a professional statistician I'm acquainted with calculated that the average point-of-impact from several 3-shot groups will vary around .7 inch at 100 yards, which doesn't help much when calculating downrange spin-drift.
Will also note that Elmer Keith, who did quite a bit of long-range target shooting, and what was considered long-range big game hunting back in his day, preferred to sight-in his long-range hunting rifles 3 inches high at 100 yards--and half an inch to the left, to compensate for spin-drift with a typical RH twist barrel.
Agreed. I have read as much of your fine works as possible but don’t recall anything on spindrift. As I am familiar with artillery and naval gunfire characteristics, I understand spindrift. I just never gave it much thought to high velocity rifle trajectory at modest ranges since I don’t like to shoot much past 300 yards at game. But since I now have a 6.5-300 Weatherby, perhaps I should visit the spindrift effect for out to 500 yards or less. Any further insight or suggestions would be most welcome! Steve
