Ocatgon Barrel

[jaxenro]

If I have a small pistol barrel I want to be octagonal and I can only find it in round, how to I make it octoganal? I only have limited tools, is it simply draw file to shape?

 

You already have it, but you can only find it in round?

Octogon pistol barrels are available in every caliber and size one can imagine. Log Cabin Shop, TOTW, Muzzleloader Builder Supply, Tip Curtis all keep a wide variety os sizes, beside the barrel mfgs that sell direct.

It is probably not a good idea to drawfile a round barrel octogon. Most are pretty thin walled anyway and you are talking about taking meat out of the wall thickness.

 

[Zonie]

Draw filing is not difficult but it is a lot of work.
As Ghost mentioned most round barrels do not have sufficient material on them to allow reshaping it into an octagon. The remaining wall would most likely be too thin to be safe to fire.

I have no idea of the diameter of your barrel or the caliber but if the barrel is .750 inch diameter, the distance across the flats would end up being .69. If the barrel is .625 inch diameter, the distance across the flats would be .577.
Generally speaking a rifled barrel should be thicker than .150* thick in the breech area. This would limit the caliber for the .750 dia barrel to .69-.30 or .390. For the .625 dia barrel the caliber should be less than .325.

* The .150 minimum thickness is based on a modern high quality low carbon steel with moderate loads.

Zonie

 

[jaxenro]

I'm making a set of muzzleloading parlor pistols in .177 caliber. Load will be only a musket cap set on the nipple, although I might play with 1 to 2 grains of fffg, so I doubt strength comes into play.

I didn't buy the barrel's yet, but the only .177 I can find is round, especially slim enough for the scale. (Replacement barrels for air rifles) I am looking at 9/16" at the "breech", tapering to 1/2" at the muzzle. I've sketched out my design a few times and round just don't look right.

 

[Zonie]

Your 9/16 inch barrel will be .520 or smaller across the flats. At the 1/2 inch muzzle, it will be .462 or smaller across the flats.

That would leave it 9/16 and 1/2 across the corners of the octagon. :grin:

Zonie

 

[John Taylor]

I did a BB gun many years ago, with 4 grains of 4F it sounded like a 38 special and would put a BB through a 1" board at 25 yards.It only had a 2.5" long barrel made from brass.

 

[arcticap]

If you don't want to use a round barrel, or if you don't feel confident making your own barrel flats because of the taper etc..., you could try to use a thinner .177 barrel as a barrel liner inside either a used octagon barrel or a properly drilled octagon blank. Or you could have the selected airgun barrel milled (or fitted) by someone properly equipped.
Gun Parts Corp. has some inexpensive parts and there are outfits who specialize in installing liners.
Personally I think round would look just great. :hatsoff:
[url] http://www.davide-pedersoli.com/ArmiCategoria.aspx?CategoriaId=120&lang=en[/url]

 

[jaxenro]

I like the pedersoli's, but mine are based more on something like this (simplified, and at about 2/3 to 3/4 scale)

 

[arcticap]

Here's one that was rebuilt with a .177 barrel used as a liner:
[url] http://www.ctmuzzleloaders.com/mlexperiments/parlor_pistol/parlor_pistol.html[/url]

 

[flintlockmdj]

Sorry that it is taking so long to get the barrell to you but it should be in the mail this weekend.
Doug Johnson

 

[flintlockmdj]

Again I apologize for the delay shipping the barrel to you but it was mailed at the USPS in Milledgeville Ga. yesterday so you should get it soon.

 

[jaxenro]

That's fine - as this was a little bigger than my original intent I'm changing my plans a bit, so I then needed to buy as bigger piece of walnut, which is a bit wet and needs some more drying time. So it will be a bit before I really get started again in this one.

I find I tend to collect parts and projects, now I'm back to restoring/rebuliding that shotgun I had planned a while ago.

 

[flintlockmdj]

I have the same problem.