Yes, as far as we can tell. Just in case you are a history buff here is the link where I saw this information:
http://www.historynet.com/battle-of-little-bighorn-were-the-weapons-the-deciding-factor.htm
In case you are not a history buff but still mildly interested, here is a snippet from the article:
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.’