As I have said Many times before, go someplace & shoulder one......... You are just guessing & believe me, I guessed at them for Years & was always dissatisfied with the results. :shake: I started going to places & actually shouldering what I was wanting & found out what it means when one fits :shocked2: cause then I had about 20 that didn't fit to get rid of :haha: I could have saved allot of money by just taking a day or two of looking & driving 200 miles, shouldered about 75 rifles, had a great time doing it & being away for a day or to & etc. :rotf:
I think you would be surprised what a 42 or 44" barrel in one would feel like. A "B" weight barrel in a southern mountain rifle is pretty light. And a 13/16" barrel in 42" with a .40 or .45 cal is pretty light too. I am building a Tenn. with a 13/16 x 42" in .50 cal. right now & I was really surprised on how it balanced. Not as well as a swamped barrel, but very acceptable.
Also, as mentioned, you need to talk to he vender/stockmaker & see if he does the barrel channel you want. IMHO, unless you really know how to make things work on building a rifle, best to get ALL the parts at one place, with exception of the lock. I suggest ya use a Chambers flintlock on the rifle regardless of what ya build. Make sure the stock will accept the lock you are wanting to use. :hmm:
Good Luck ! :thumbsup:
PS: The only way I would use a 38" swamped barrel was if it were a small bore in A or B weight to make it look slimmer. As mentioned above, a 38" barrel will make the rifle look stubby & a southern rifle should be long..... 40" barrel will work but a 42-44-46" is better, IMHO.