Here's an excellent and comprehensive article on the Winder Muskets, written by Bert Hartman, historian and board member of the Winchester Arms Collector's Association (WACA). It was first published in WACA's "The Winchester Collector" magazine in winter, 2010.
https://surplused.com/index.php/2020/05/15/the-model-1885-winder-muskets/Here's a forum post discussing the article and the rifles, along with an update from Bert.
https://winchestercollector.org/for...del-1885-winder-muskets-by-bert-hartman/It's noted that almost all the Model 87's were chambered for 22 Short, but a snap cap confirmed that the chamber on Pope's gun (with Dubiel barrelj) would fit 22 Long Rifle.
