TC 50 cal Hawken bore dimensions?

Does anyone have groove diameter info for the TC Hawkens in 50 cal?

Please note this has nothing to do with muzzle loading load info, it has to do with the barrel being compatible for use as a potential 50-70 trapdoor Gemmer conversion, I need actual groove diameter info. I realize there will likely be some variation in individual examples, but they will be made to a target spec, which is what Im attempting to find out.

Thanks.

 

Going to depend on how many there are.
My 6 groove they run .09- maybe little ove .1. When I did a recut on it an .09 bit followed very good.

 

Malamute:

As best I can measure with my "early" T/C Hawken .50 rifle, bore: .500"/.501", Groove: .512", twist 1 turn in 48". My gun may be tighter than normal. Later rifles, especially those with the "QLA" relieved muzzles seem to be slightly larger (at least a couple of my friends' rifles are)

 

Thanks. The specs on 50-70 bullets run .515, but considering there is no factory ammo, I guess one could size down a little. Still, in a single shot it would be nice to not have to size bullets or cases. I should check to see what diameter the Lyman 50 cal moulds drop out at.

I have an 1868 action ive been wanting to build a period correct style trapdoor Gemmer, but I dont think my budget is sufficient for that, and I may not live long enough to enjoy it if I dont do something with it before long.

 

ism it possible that the top of the lands are .50? and the bottom of the grooves are .504? i dont think they were cut , but swagged barrels. lets give the shooter here perfect diam. as he asked for. 4 thousands deep is good enough for what you want. the thompson hawken shoots well for 70 grains of real black and a patched round ball. or 100 grains of real black and a sabot with a 250 grain .451 bullet in it. to shoot a full cast bullet it would have to be a 300 grain .504 or something like that for the 1/48 twist. anything bigger would be not the right one for that twist. the best twist for a 50 cal with a cast bullet is 1/32. the long range shooters use 1/27. to me that isnt as good as the 1/32. i built one at 1/24. required a 720 grain cast bullet to shoot good. it wopuld drop anything in north america but that was too much lead going down range. before i sold that gun to a elk hiunter i shot a deer with it. it knocked it sideways several feet and blew a hole though it like a cannon hit it. too much gun for a deer. elk wont have a chance. that 720 grain bullet didnt kick all that much but it was ment for really big game and nothing else. the 1/48 twist is good as you wont have to have much over 300 grains to shoot. remember that the over one mile shot that made billy dixon made was with only a 400 grain paper patched bullet in poss. a 50/ 90 straight. a 50/70 is a dream come true cal. with black horn 209 powder it will shoot as good as a 50/90 straight. in the fur traders museum near chadron ne. their is like new 50/ 70 springfield. in the white.. i go nuts inside every time i see that gun. never ever been shot much, and the most perfect gun anyone could ever own. they sell their stock their if someone has the money. that one would take money. the 50/70 is a good gun to build.

 

If the groove is .512 it's a smooth bore. Grooves on a 6 grooves 6 lands are between .09 an .130 depending on width of lands. Hawkens I've seen are 6 grooves 6 lands