Some observations:

A whitworth rifle fired from Ashby's Gap by Hardaway's Alabamians was used to scatter a union force near Upperville, Virginia, over 3 miles away ~ best long range work of the war. (Official Records Volume XXI, page 37, report of Gen. D. H. Hill)

BUT, Colonel MacIntosh (who commanded the only 2 whitworths in the Army of Northern Virginia from 1863 to the end) wrote after the war that the Whitworths were a nusiance, heavy to move, caliber too small to deliver effective damage, ammunition expensive & difficult to obtain, the breech mechanisms often "welded" (?) shut to prevent blow-back; the gun was not worth the trouble required, in his opinion.