No all Bisleys were not 44-40. All 44-40s we're marked frontier six shooter instead of single action army. Something to do with the colt/Winchester rivalry. Winchester never chambered there lever guns in . 45 colt and but colt chambered there revolver in 44 WCF (44-40). But I'm working from memory which isn't what it used to be so I am probably totally wrong. Your Tombstone find is absolutely amazing. I was in Cody WY this summer. The Cody Firearms museum is awesome. But equally interesting there is a Found Guns Museum that is all about similar finds and there stories. Good stuff I love history.