From History Net:
"Not until archaeological investigations were conducted on the battlefield during the 1980s did the extent to which the Indians used gunpowder weapons come to light. Modern firearm identification analysis revealed that the Indians had spoken the truth about the variety and number of weapons they carried. The Cheyenne warrior Wooden Leg went into battle with what he called a’six-shooter’ and later captured a Springfield carbine and 40 rounds of ammunition. The Miniconjou One Bull, Sitting Bull’s nephew, owned an old muzzleloader. The Hunkpapa Iron Hawk and the Cheyenne Big Beaver had only bows and arrows. Eagle Elk, an Oglala, started the battle with a Winchester. White Cow Bull, an Oglala, also claimed to have a repeater.
There were 2,361 cartridges, cases and bullets recovered from the entire battlefield, which reportedly came from 45 different firearms types (including the Army Springfields and Colts, of course) and represented at least 371 individual guns. The evidence indicated that the Indians used Sharps, Smith & Wessons, Evans, Henrys, Winchesters, Remingtons, Ballards, Maynards, Starrs, Spencers, Enfields and Forehand & Wadworths, as well as Colts and Springfields of other calibers. There was evidence of 69 individual Army Springfields on Custer’s Field (the square-mile section where Custer’s five companies died), but there was also evidence of 62 Indian .44-caliber Henry repeaters and 27 Sharps .50-caliber weapons. In all, on Custer’s Field there was evidence of at least 134 Indian firearms versus 81 for the soldiers. It appears that the Army was outgunned as well as outnumbered.
Survivors of the remaining seven companies of the 7th Cavalry asserted that the Indians were equipped with repeating rifles and mentioned Winchesters as often as not. Major Marcus Reno claimed: ‘The Indians had Winchester rifles and the column made a large target for them and they were pumping bullets into it.’ Although some white survivors claimed to be heavily outgunned, Private Charles Windolph of Company H was probably closest to the truth when he estimated that half the warriors carried bows and arrows, one-quarter of them carried a variety of old muzzleloaders and single-shot rifles, and one-quarter carried modern repeaters"