In partial answer to your question, the Coast artillery Service Practices were conducted against moving towed targets. The closest documention on accuracy is the enclosed table which shows the probible error of the weapons systems stripped of all nonstandard errrors, ie human, Powder pressure variance, nonstandard weight projectile, projectile failure(manufacture loss of rotating band). I have only the 1911 and 1912 results and the scoring includes more than simple accuracy. Table is from TM 4-235 Coast Artillery Target Practice Feb 27 1941.
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