And diameter of the barrel

this one website said that if the powder is too fine the pressure rises too quickly

there's a reason they use different grain sizes in modern rifles

look at the grain size used in 50bmg and 22lr

Idk much about black powder rifles, I’d just look at forums about it to get your best answer

this book says "for academic study only" so it should be ok

thanks to both of you

found this is another pdf

Commonly called “Four F”, this is the finest
granulation and is used for priming flintlocks.
Due to its rather limited use, it is usually
somewhat difficult to obtain. When necessary,
FFFG may be substituted. There is no
Pyrodex equivalent.
FFFG/Pyrodex “P”
Commonly called “Triple F”, this powder is
used in most single shot pistols and all
percussion revolvers. It is also popular for all
smaller caliber rifles up to and including 50
caliber. When FFFFG is not available, FFFG
may be used to prime a flint lock.
FFG/Pyrodex “RS” and “Select”
Commonly called “Double F”, this is a popular
powder for rifles over 50 caliber and up to 75
caliber. Also used in the larger caliber single
shot pistols and most shotguns.
FG
Commonly called “Single F”, this is the
coarsest granulation used for small arms. Use
is pretty much restricted to rifles over 75 caliber
and large bore shotguns. There is no
Pyrodex equivalent.

this pdf

I wanna make shotgun shells

thanks

>iamprepper

@Clitzkrieg

here

thankerino

https://www.primalsurvivor.net/homemade-shotgun-shells/ also this for anyone interested in the same thing

http://www.tbullock.com/bpsg.html

I also have 6 7.62x54R shells that I could reload but it would be hard to machine something for them with my tools

all I need now is a good 12 gauge tube

would mild steel work?

or do I need hardened stuff?

if i recall pressure on a 12 gauge is actually really low like at 12k psi so i would guess just black iron pipe would work

dont quote me on that tho

if unshure use whatever is safer

It all depends on how long you need it to work for

20 shots? Mild steel will work. More than that, you *will* get fucked

I personally hope not at all

Remember hardened steel is brittle

but considering the amount of that thing will be here for, I don't wanna have to go finding a strong another pipe for a shotgun

hmm

Use regular pipe

hmm, google is saying a Cr,Mo steel type

Just have interchangeable pipes

https://www.hunker.com/13401400/pressure-ratings-for-a-schedule-80-black-iron-pipe
schedule 80 steel pipe is what you want i think. rated for a burst pressure of 14k psi

Or fit a 1 inch pipe over a 3/4 inch pipe and solder it together

All still has chromium and Molybdenum in it

yo kekno you're a fucking genius

Thanks

*braze

*weld

Either will work