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7189 No. 7189 ID: d41f3a
Paging Acid or other likeminded folks.

Prefacing this with the fact that I know very little about what I'm asking:

As I understand:
1: A major difficulty in the proliferation of 3D printed guns is getting ammo for them in some places

2: if you take the tinfoil wrapper from gum and apply the metal side to a 9 volt battery it makes fire

3: some old school guns used paper walled cartridges

4: Blackpowder is easier to make our of local shit you have lying around, and lower pressure making it less likely to cause a kaboom.

Would it be possible to make a firearm with a paper rolled cartridge and a 9volt and gum wrapper ignition system with a blackpowder load?
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>> No. 7190 ID: cbf3af
In short, yes.

Black powder has very low explosive velocity and a gradual pressure curve. It would be even easier on the plastic than a regular round would be.

The kicker would be in the engineering. How to you ensure good electrical contacts? How would you reload it? Black powder is VERY dirty and carbon intensive, so fouling would be a major issue. Shot velocity would be very low.

You might as well make it a muzzle loader, tbh.
>> No. 7193 ID: 73d6fe
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Are there any other chemicals that could be used as a propellent that are as common but are less corrosive without being likely to cause a percussive failure?
>> No. 7194 ID: 73d6fe
And what kind of math formula would i need to make sure i'm not going to lose a hand from percussive failure?
>> No. 7198 ID: cbf3af

Look up "red powder."

Sugar, iron oxide, and potassium nitrate IIRC. As good as black powder but cleaner and usable in modern weaponry.

There's gonna be a LOT of factors involved in determining safety if you want to crunch numbers...
>> No. 7207 ID: 98c32e
>> No. 7208 ID: bdc075
You have .... intrigued me. How much cleaner?

I was going to say, look into a ferguson rifle. Not cheap, but your dick will get hard.

Why not just use rolled cigarette paper cartridges that burn up?
>> No. 7209 ID: 4c7baf
Get a threaded pipe with a pipe cap. With some small modifications you can make a blackpowder rifle that takes cartridges. All you have to do is unscrew the cap and slide it in.

I forget what it's called, but it is a very simple design.
>> No. 7210 ID: bdc075
The problem with this is still priming and fouling. Hence why I'm suggesting the most elegent solution, the Ferguson rifle. But, that'd be a massive cunt to make.

But, it's way better then say, a black powder pipe rifle.
>> No. 7212 ID: d41f3a
A thought occured to me:
How viable would it be to make the casings themselves be 3D printed?

As I understand, a cone shape has the highest structural integrity? What if the ammuntition was in a similar arrangement to a shaped charge with the bullet at the fore end?

I'll try and get some drawings scanned soon.
>> No. 7224 ID: 8049a9
Why the duck wouldn't you cast it instead of 3d print
>> No. 7260 ID: cbf3af

Much cleaner than black powder, but obviously not as good as smokeless.

Basically the sugar and potassium nitrate have a better oxygen balance and hotter combustion temperature than charcoal+potassium nitrate. This means that more of the propellant fully combusts, which means less carbon residue left behind (more of it is blown out the barrel as hot gas).

There was an American soldier in the Phillipines in WW2 who got the resistance there using it, and it was clean enough to run machineguns.
>> No. 7264 ID: 254d85
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How about just making a "adapter cartridge" that holds a bullet and the blank from a powder-actuated nailgun?
>> No. 7323 ID: eb5fad
Nitrocellulose isn't that hard to make. If you can't synthesize it, you don't have the skills to be making your own ammo TBH.
>> No. 7343 ID: c846d4
What about using copper tubing to make cartridge cases?
>> No. 7345 ID: 972df0
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What about injection molding one's own cases? Dave of Vince Gingery wrote a book on making one's own injection molding machine.

There used to be a device called a Tap O Cap that allowed people to make their own percussion caps out of soda can aluminum. I suspect one would be able to use such a device to create a Berdan primed polymer cased ammo using black or red powder and a cast lead or maybe copper bullet.

Pic related, it's a USAC polymer cased .38. They didn't' catch on when introduced.
>> No. 7425 ID: 7188a3
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Walls are generally too thick to work well. To fit in a SAAMI spec chamber and hold a bullet, the bullet will either have to be undersized or heeled. You might be able to swing it with a minie-style hollow base in the former situation.

There's also the possibility of cases splitting so badly as to FTE or not springing back enough to provide sufficient clearance for extraction. With enough experimentation and custom-reamed chambers, though, it's feasible to make old Maynard-style cases from tubing and sheet brass/copper stock. Personally, I'd first try making foil cases a la .577 Snider.
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