Phil that is the thread. I linked the thread and referenced you but got cold feet as I was unsure of this forum's ethics regarding that particular forum.
I'm interested in the HBC trade gun, most likely an early Barnett. My family homesteaded in Salt Prairie Alberta (High Prairie region) in the early 30's and did much business with the HBC posts in the north. I remember back to the 50's and remember only Lee Enfields everywhere.
I want to build from a walnut blank or preferably a shaped blank with ramrod channel and hole done but no inletting for the lock or barrel. Recoil is an issue as I grow wiser or just plain older. I'm a natural borne rifleman so tackling a prb smoothbore challenge is my goal, no hunting or shot.
Mike's numbers are workable for a Pecatonica stock and he is like the old E. F. Hutton commercial for me! When he talks I listen. I would like to thank such skilled smiths and shooters for all the honest well informed advice I get so generously here. A special call out to Bill Raby and his videos. They convinced me I can build a first gun, thanks.
How does a 24 gauge kick with a decent stock for 50 paces loads?
Is a 28 gauge correct enough for HBC guns?
S. James Gooding's research of HBC records suggested that 28 balls to the pound was the standard or most common size from HBC orders for NW trade guns. That is equivalent to a ball size of 0.550", and assuming windage of 0.02" to 0.03", a bore size of 0.570" to 0.580". I don't know how historically accurate you want to be, but a .58 cal smoothbore would be best. If that's not high on your priority list, then a 28 gauge (.55 caliber) barrel is close.
My advice on drop (from which ever point one wants to measure) has little to do with perceived recoil or "cheek slapping". Neither the Caywood trade gun nor the Hayes trade gun are uncomfortable to me to shoot with respect to recoil or "cheek slapping". I was simply advising from the perspective of being able to aim down the barrel when shooting a patched round ball.
Keep in mind that the NW trade gun has a comb that is more angular than most fowlers and other types of trade guns. It can make it difficult to get ones eye low enough to use the barrel as a sighting plane. This could probably be addressed by building in some cast off like
jerrywh mentioned.
D. Caywood NW Trade Gun CombM. Hayes NW Trade Gun CombI don't know what Pecatonica's return policy is, but you might be able to order a stock from them and try sighting with it before you do any work on it to see if it fits you. If not, you may be able to return it and be out shipping costs only.
I've gotten more recoil sensitive with age, too. I manage it by reducing the powder charge when I'm target shooting. Whether you are shooting a 20 gauge, 24 gauge, or 28 gauge, I suspect you can find a moderate powder charge that will give you adequate smootbore accuracy out to 50 paces with tolerable recoil.
For what it's worth, Barnett made guns for the Northwest Company up until it merged with the HBC in 1821. He didn't make guns for the HBC until after that date.
I anticipate your next questions are going to be about suitable barrels and locks.