ButlerFord45: The main difference in the 38" barrel to the 42" barrel will not be in sighting or brush handling difference, it will be in the balance & weight. The B40 in a 38" length will weigh 4.5#. The B40 in a 42" length is 5.1# So right away ya pick up lil over 1/2# on the longer barrel, but the main difference is in the balance.
I don't like allot of muzzle weight. I want the gun to balance as far back to the triggerguard as I can get, so the weight of the rifle is on my shoulders rather than on the forearm. Some like a heavy muzzle rifle, such as a real Hawken has a heavy barrel & muzzle. I like the looks of a Hawken rifle, but not the handling of it when I shoulder it. But anyway, the 38" swamped barrel will balance about 2" back toward the triggerguard than the 42" swamped will, thus making the gun actually feel like 1.5-2# less weight rather than the actual .6# weight difference.
As for the best builders book, I suggest Gunsmiths of Grenville County as the best one, and the next one I would get is the gun builders book by Chuck Dixon. I have them both (and a coupple others) and like these two the best, and the most detailed & best on for me is the Grenville County one.
Also, the way most of these places advertise what they call Kits is very misleading, IMHO.... Most of these are Builders Kits, not Assembly Kits. & there is a BIG difference. The Lyman, CVA, etc. Assembly Kits are ones you sand, finish & assemble. The Builders Kits like TOW, Pecatonica, MBS, TIp Curtis, Jim Chambers Flintlocks, etc. sell are parts that are gathered for you to build the rifle with, not just assemble it... It takes time, thinking, planing, and sometimes some headaches building one of these. You must be handy with hand tools, not real smart but Really Determined to get it done, cause there will be some rivers to ford while building this rifle... I have built quite a few of them now & every one is still a challenge. Sometimes the precarved stocks are more of a challenge than the blanks, if the carver didn't do it correctly.... Precarved means preshaped, NOT finished shaped or ready for Anything, just generally roughed shaped & the barrel cchannel roughed in. Some precarves are rougher than others.....
Also if you decide to build a rifle, I suggest you buy ALL of the parts from one place. This way you know the parts will all go together for the rifle you are building. You may save $50. going from here to there finding parts (50 out of 500-600) But you will spend more than the $50. you saved on shipping costs sending back inferior parts, wrong parts, parts that don't fit, parts you thought would look right but after ya get them they don't, etc. Believe me, it is Not worth the hassle. That is why I was saying I like to go to Tips shop and lay the entire gun out. I can see what I am getting, personally pick out my Lock, Barrel, Stock, Trigger, Trim, etc. from hundreds of others, and not have to accept what someone else grabbed off a shelf. (He also has In-the-White rifles built that you just finish that are quite reasonable)
As for going by Tip's next time, "IF" I need something it will most likely be right about Dec 23, 24th or 26th-27th as I am not sure yet what the CHRISTmas travel plans are. But it is unlikely I will need anything right now as far as I know I am pretty well set up on parts for the next 4 rifles, unless something comes up I missed. I buy all my rifle parts for customers at least 6mo in advance & ones for me I have had longer at times.
If I do go there I can meet you there, however we will have to make timing right as I am already on a 11 hr trip & don't want to dilly-dally around too awefully long. I want to get to my destination, relax & visit & etc. and a 3 hr stop over at Tip's on the way would make it a tough drive. On the way back is easier for me, as if I get too tired I will just get a motel & stay the night in Nashville or Bowling Green. Allot depends on the traffic also, if it is real bad, I get a motel as I don't like racing with the rampant ! ha ha ! Email me about the 20th of Dec. and I should know by then what date I am going & if I am stopping. If we can't meet there I could possibly meet you someplace on the way thru KY and I can show you a Haines "In Hand" and possibly a 1770 Lancaster also with a 42" barrel if I have it done tby then. Or possibly we can meet at Tip's after CHRISTmas holiday & maybe meet up with PackDog or someone else there & shoot the bull.... And I would be most happy to help you pick out a suitable stock & parts, etc for a rifle.
PS: If you are now laughing about being at Tip's for 3 hours, you just keep on a laugin'. Cause I have no doubt in my mind I will leave there long before you are ready to go! ha ha ! I have been there Lots of times & several times for 1/2 day & still didn't want to leave.... ha ha ! Others that have been there will tell ya the same thing.... it's hard to leave the dang place ! :grin: