Fox found no such archeological evidence of Indians firing "volleys." He found repeaters in Indian hands. But there was in fact no evidence whatsoever that ANYONE fired "volleys." It was sporadic, steadily infiltrating fire, which caused Keough to move TOWARD Custer. Moreover, Custer's men were never sufficiently coalesced for volleys to have been that effective. Evidence that (I might get my directions mixed up) he was far to the northwest of the village before returning, and began taking fire at the bottom of the hill/ravine, before gradually moving up to (and past) "Custer Hill."
Even allowing for substantial pilferage of cartridges, Fox's archaeological evidence based on the post-fire, newly revealed ground, would STILL have revealed SOME evidence of lines, or groups, of shell casings if there were volleys. But he found no such evidence.
Fox based his researches on cartridges 110 years after the battle, whith relic hunters having picked up thousands of shells before he was born.
His conclusions are therefore bogus.