threads for breech plug

[camerl2009]

ok so what to use corse or fine threads

for my double i have a choice of 1"x8,1"x12,1"x14 witch to use threse are damascus affter all

[rich pierce]

Look at the breechplugs offered by any parts supplier for a Brown Bess for example.  PM sent.

[bob in the woods]

My 10 bore has a 7/8 x 14 I believe.

[camerl2009]

My 10 bore has a 7/8 x 14 I believe.

yea well i need to do this on a set 12ga barrels so the chambers are where the breech plugs are going and i need have good threads the min Diameter of 7/8"-14 is .785 and the chamber on a 12ga is .812 (or more some times)
the bore on a 10 bore is .775 so 7/8"-14 just make's it

[bob in the woods]

I was actually referring more to the "14 " since you already indicated that you were using a 1 inch
Your choices of 8, 12 or 14 were the variables. I'd go with the 14, myself.

[camerl2009]

I was actually referring more to the "14 " since you already indicated that you were using a 1 inch
Your choices of 8, 12 or 14 were the variables. I'd go with the 14, myself.

ok fine it is 

[Daryl]

Yes - 1" X 14" is the one I'd go with too.

Do you have the book yet? You should shorten the chambers to establish proper plug length and diameter, ya know.  You really need to purchase the book on this conversion as it is an involved proceedure, as-is making the plugs to fit properly.

[Blacksmoke]

I am with Daryl - more threads per inch are better even if they are a finer cut.  That's how I would do it
Hugh Toenjes

[Z. Buck]

although you have been strongly suggested many times to purchase the book you seem to look down upon this with claims of "waste of money" the simple fact is regardless of what you think, firearms engineering is vastly different from rebuilding an engine, or even reloading some bullets. if you cannot afford the book, you need to at least get it from inter-library loan. i am sure it is floating around in the aether somewhere for less than  70 dollars.
long story short, if you as a person find books a waste of money then you are no friend of mine. ill bet 99% of the people on here have spent as much money on books as the most expensive project they ever undertook, and gladly so. if you are not into the hobby to learn and expand yourself as a intellectual and craftsman, then you have allot of learning to do. the wise men here all know that they know just a smidgeon of what can be known, yet you seem to already know it all, which makes me wonder why you ask so many questions.
In general, beside a few very giving individuals, people will only be willing to help other as far as they are willing to help themselves.

[Bill of the 45th]

He don't need no stinking book, he's seventeen, and knows everything.  With age comes wisdom, if you live long enough.

Bill

[camerl2009]

 inter-library loan lol this is canada gun's are looked at by most people as evil

i doubt the library will have it becuse of the above im probably on enough gov watch lists for my view's i dont need the cop's at my door becuse i went to the library to see if thay had a book on building a double barrel flintlock

i have the money and enough tools to make it

i dont see how this is any differnt then building a race engine as lives are on the line when it comes to both and it counts even more when that engine is made to go 8 sec down the 1/4 mile

this is not my first gun build i sold a fowler to buy my martini henry so i have a moose rifle now $1200 later that is with the dies, 20 pieces of brass ($5 a piece) a biger press for the 1 1/4"-12 dies, bullet mold, and all the clening stuff for the matrini henry affter that im broke   

the farmer i help in the summer is not raising pigs anymore  so my summer money is a no go all i got right now is $300 that i got for 3 wolf furs i had tanded

[whitebear]

You need to stick with the Martini Henry and get another summer job, save money until you can afford to do the job the right.  The slogan for the company I work for is "The Right Way Is The Safe Way" this is true with most things especially guns.  You are comparing apples to cow patties.  Comparing apples to oranges is similar in that both are fruit but comparing building a double barrel muzzleloading shotgun to a motor for a dragster is completely different.  Yes both will kill you if handled improperly but why take a chance on building ether improperly and hurting or killing some one.  Again you need to buy the book and read it before you proceed.  Put an add on this forum and others for the book, used is just as good as new and a lot cheaper.  Check half.com and see if they have it used.

My son is building his first rifle now but after finishing one step and before he proceeds to the next step I have him look it up in "Recreating the American Longrifle".  He is 35 years old but I want him to enjoy what he is doing now and in the future, if he blows himself up he won't enjoy it much.

[whitebear]

I just went to bookfinder.com and typed in "recreating the double barrel muzzleloading shotgun" and found 12 copies from $46.00 used  to over $100.00 for a signed first edition.  This is all that I know to do for you, if you won't buy a copy of the book then I can't help you.

[camerl2009]

well if i buy the book then i dont have enough for the locks and wood for the stock  

in fact i cant buy the pre made jim chambers locks i wanted and i hate tuning locks

i checked the library online and thay do not have it as i thought

oh and the martini henry has 2 uses for me moose and bison hunting thats it

cant hunt with them in my area as only thing i can hunt with a gun is small game and cant use a bullet bigger then .275" unless its a muzzleloader

and i want to switch all my hunting guns to antique classed guns to save ammo for the more $$$ cals like .303 witch is going up big time

[Old Ford2]

Cam,
The greatest part of any journey is the planning and getting there.
So it goes with building fine muzzleloading guns.
Studying their design, architecture, and metal works, any shortcut will result in a less than desired end result, and you will always reprimand yourself for not doing it right, the first time.
There are many builders here from the lowly ( like myself ) to Mr. Getz and many others in between, each learning from others, but research, guidance, and knowledge are the key to a fine masterpiece.
Any "FOOL" can make an "inline" that will go "BOOM", but that is not what we're about here.
Master Plugger & Fixer-Upper
Old Ford

[mattdog]

Whoa.  Give him a break.  He's asking questions about building a gun, not how to proceed on a journey or the Zen of gun building.

Please notice that there are 281 hits on this thread.  He asks a question and guys like me read the answers (from you) and learn something too.  

I have a fair library, uncountable amount of money invested because I am immersed in the trade, obsessed, as some would say.  Not everyone is as dedicated or has the desire or the money to invest.  'specially if they are only building as an end to a means like Camerl2009.  At least he is ASKING THE QUESTIONS and not blindly pushing forward.  If you discourage him he will stop asking/posting and he and all the rest of us lurkers lose out.

Thanks to all of you for valuable advice and information.

Matt  

[44-henry]

If you are interested in saving some money than you really should buy the book. Brockway provides detailed information on building pretty much every part except the barrels from scratch. If you don't count your time, building the gun as Brockway describes is not all that expensive. I never actually got started building one, but I bought the book when I was in high school and read it so much that it started to fall apart on me, later I bought another copy--its really that good.

[Dale Campbell]

Cam,

44-henry has a good point.  Spending the bucks on the book will save you many $C in the long run by helping you avoid a mistake or many mistakes that come from being out there on your own, on what is a pretty challenging project. 

I was in somewhat the same situation building my first rifle.  I was 14 with no job, but spent the money on McCrory's book since it was the cheapest out there (probably about the same price w/ inflation).  It got me through.  There wasn't anything like this forum available.  But if there was, I wouldn't have even known I needed to ask a specific question, forget asking the right one.

Bite the bullet, get the book.  When you have the finished gun in your hands, you'll be happy you did, and happier with the gun.  And you will have saved money by not having to get multiple replacement stocks, or new expensive parts for locks...

[Dphariss]

ok so what to use corse or fine threads

for my double i have a choice of 1"x8,1"x12,1"x14 witch to use threse are damascus affter all

The wall thickness is something to consider when tapping a barrel. I would use the smallest diameter that will give 75% or more thread depth in a shotgun barrel since these usually have a thin wall.
Coarse or fine is really not important so long as the thread length is 1/2 or over personally I would use the fine thread. They are usually easier to cut.
Use a good cutting oil. I would use the Castrol Moly bearing stuff (because I have it) or similar.  Hard spots are a possibility and can cause grief even with good lubrication. Use a new tap, two actually, a plug or as issued bottoming to start and a shortened bottom tap to finish. Plug needs to fill all the threads so must be fit carefully.

The short one has been reground several times before I decided to by a new tap to start holes with rather than grinding it to a start tap then shortening to bottom.
I would also buy a GOOD tap from MSC or other supplier and try for an H1 tolerance for a tighter thread fit.

Dan

[Tim Crosby]

 This thread is locked, it has run it's course.

 Tim C.