Can't really help you wioth the "Trade", but I did tour Boot Hill at Tombstone back in 1985. Still recall the Epitaph written upon Lester's headstone.
"Here Lies Lester Moore.
Took Four Slugs From a 44
No Les
No More"
Sorta surprized Wilma would have had the gun, seems it would have belonged to his "Antagonist"
!Unless of Course!! Nah, Surely Not??
Reckon maybe that "Old Gunsmith" sold as many guns belonging to Wilma as Mrs "James" sold of ""Jesse's""??

Miller/TN
I Didn't Say Everything I Said, Yogi Berra