Burst Disk Marble Ammo

[PCGUY]

<div align="center">BURST DISK MARBLE AMMO

Provided By - GalFisk

I finally got a camera, so here's a how-to on making burst disk ammo, which will fit, with modifications, breech-loading minis and possibly other breech loaders too. (I apologize for the picture quality, the flash is broken and I'm returning the camera as soon as I've taken the pictures I want)

The parts you need may vary, you need LDPE plastic (trash bags, grocery bags) for the bust disk, the ammo you want to shoot, a heat source, and a mount that has the shape of your breech.

I this case:
A blowtorch, a plastic bag, a marble, a piece from the barrel, and a bottle (in this case a former chamber).

<img src="http://www.spudfiles.com/official_pics/whatyouneed.jpg">

First, stretch the plastic bag over the mouth of the bottle

<img src="http://www.spudfiles.com/official_pics/step1.jpg">

Place the marble on top of the plastic

<img src="http://www.spudfiles.com/official_pics/step2.jpg">

Fold the plastic bag around, so you get another layer of plastic on top of the marble. Make sure that the double layer of plastic reaches beyond the end of the breech (in this case, the flange on the bottle neck).

<img src="http://www.spudfiles.com/official_pics/step3.jpg">

Now place the piece of barrel pipe on the bottle neck, and press down until the plastic is held between the neck and the pipe. This is how my gun is assembled, you need to have something that works like the breech in the gun where the ammo is to be used. Using the gun itself is not recommended, I'll tell why later

<img src="http://www.spudfiles.com/official_pics/step4.jpg">

Now begin to cut alongside the edge, leaving bout 5mm (1/4") of plastic.

<img src="http://www.spudfiles.com/official_pics/step5.jpg">

Like this

<img src="http://www.spudfiles.com/official_pics/step6.jpg">

When you're finished, it should look somewhat like this

<img src="http://www.spudfiles.com/official_pics/step7.jpg">

A nice even edge all around. Following the flange on the bottle works nicely in this case.

<img src="http://www.spudfiles.com/official_pics/step8.jpg">

Now, fire up the torch. Lovely

<img src="http://www.spudfiles.com/official_pics/fire.jpg">

Use the torch to melt the edge of the plastic. It will fuse and shrink, sealing the ammo inside. This is why you don't want to use your breech, it will not retain it's shape, and it will be scorched and burnt

<img src="http://www.spudfiles.com/official_pics/step9.jpg">

A lovely black, burnt and sticky edge. Let it cool off

<img src="http://www.spudfiles.com/official_pics/step10.jpg">

Now remove the piece of pipe

<img src="http://www.spudfiles.com/official_pics/step11.jpg">

And the shell (or whatever you want to call it). This thing slips onto the neck of the chamber.

<img src="http://www.spudfiles.com/official_pics/finished.jpg">

For a coaxial breechloader, this thing could be made to fit on the outside of the barrel inside the chamber. A piece of pipe could be slipped on the outside of the breech to keep the burst disk in place.

These things are incredibly loud, and will increase performance of a high ratio gun quite a bit, especially with undersized or low friction ammo. This method will not work unless there's enough space between the projectile and barrel to squeeze in a layer of plastic. Grocery or trash bags work good in my gun, the optimal thickness depends on the caliber and chamber size.

As usual I take no responsibility on how these plans are used. Be safe and have fun. And do wear hearing protection.

Provided By - GalFisk</div>

[joemama]

what size pipe did u use and dose this work in a phunamic cannon

[spudshot]

it will work in a PNEUMATIC cannon, not sure what size pipe he used, since he's in sweden (or was it norway?) their pipe is metric

[nabu92]

cant u use a heat gun instead of a blow torch?

[theregoesthewindow]

dude anything will work if it melts the plastic

you could even use a match

[A-98]

hmmm so you have to have a breach loader
if you dont know the size of the barrel what size was the bottle ...i want to us e a 3/4 in barrel but its too small for my water bottle
thanks

[GalFisk]

The barrel ID is about 30 mm. You don't need a bottle, just some kind of jig that will hold the projectile and plastic while you cut and weld it, and that shapes it so it fits in the cannon. The method could be modified to make burst disk ammo for union or camlock loading, which would be nice for hybrids (if the plastic is strong enough).

[sgort87]

Wow, there have been o lot more posts here by Spudtech regulars lately. It's good to see you here GalFisk.