Some comments on my photos above. If you enlarge the Swiss 1 1/2 photo by left-clicking it, you can read my target. Note that a powder measure (the first one on the left) that held 100 grains by weight of Goes 2F held 117 grains of Swiss 1 1/2F by weight! That is one reason Swiss is called hotter, and why I make measures to hold by weight each charge of each powder. The black can is the first Olde Eynsford sold at Fort Bridger, I bought it in September 2012, it is 1 1/2F. The can is marked "test sample NOT FOR SALE".
Then the photo of the brass-mounted Hawken. It was not out for Bob and me to measure at the firearms museum in Cody when we photographed and measured all the Hawkens which were available to us in December, 2018. It is quite different. I scaled it out from Gordon's photo, using a measurement of 4.85" for the lock plate, which we measured on Liver Eating Johnson's lock, shown on page 375 of Gordon's book. It scales out 52.8" long, with a 36.4" barrel, 18" fore end, snail to nose cap (LEJ's is 14" measured), and a length of pull of 14.27" (LEJ's was 13.375"). It is unlike other Hawkens, except the WS Hawken, which is so totally different as to be ugly to my eyes. Besides, the bore is very rough. We measured that one, too, or tried to, the bore was so rough I could not determine a diameter.
Another comment on caliber listed in the Cody Museum web page. They measured the muzzles with a tapered brass bore gauge and think that is the caliber, but all Hawkens have a relieved muzzle, and the actual bore diameter is smaller. We pushed sized bore "jag" gauges into the bores to actually measure them. Liver Eating Johnson's rifle bore is .583" at the muzzle but .537 in the bore. We measured the twist and got one inch in 50.8", which is probably really 1-48".
Gordon's book pictures 29 "Plains rifle" Hawkens, and eight have patch boxes and one a cap box.