The entire three season dvd of the show is available from Amazon, 'etc.
All nearly 100 episodes.
In the show, the gun was supposed to be chambered for the 45-70 cartridges that McQueen carried in his belt loops.
But the gun actually was chambered for the pistol rounds he used to reload.
44-40 or 45, maybe.
Great show, though.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”