I was browsing youtube today when i came across this video. http://youtube.com/watch?v=7MVUqawdms0.

Now, to me this thing doesn't look safe at all and probably isn't but before i go out and buy all the materials to make one please give me a second opinion.

Most retarded thing I have seen today. Lets see, how about we use copper (a low pressure rated material) and TATP (A highly sensitive primary explosive) To propel steel bearings not more than a foot away from your fucking head. Shit man you have been around here for a while, you should know that shit isnt on just by looking at it.

I only skimmed over the reasons this is retarded and fucking dangerous, there are plenty more but I'm seeing red after reading you wanna try that shit.

Just don't mate.

I was going to use steel for everything and black powder for the cartridges.

EDIT: yeah, i know its totally unsafe. But i was planning on remotely firing it too. its more just to see if i could actually design and make a similar one to that in the video.

Sounds like your wanting to make a small cannon. I'd recommend a heavy steel vice to hold the barrel. Make sure the barrel is thick and sturdy and rated for very very high pressures. Making the barrel from 2 or more pieces of pipe that fit snugly into each other is another option, though its unlikely that random pipes would just happen to fit into each other perfectly. The closed end will need to be secured really well. Perhaps welded on with multiple passes. I'd fire with a decent length of visco or electrically and of course be far away from it and behind something sturdy like cement wall.

Use BP with rather big granules, and start with very very very small loads.

W&C might be able to help more.

I made a very large NC cannon about 2 years ago so those are not a problem, i would however love just to make one of those shown in the video.

Okay BP cannons, all good, shit I make my own .22 pistols (so to speak).

Metal lathes rule dogs when it comes to making barrels for anything, of course drilling out a bit of stainless roundbar is an expensive practice, so hydraulic rated steel pipe is a good replacement. Something that can deal with 80,000 PSI will do (over kill, but its that or shrapnel in yo' ass). I can't think of the propper term off the top of my head... Seamless cold rolled? Something like that.

As bob said, if its a big bore (10mm and up) use a slower powder (bigger granules).

If it's gonna be remote fired and you aren't holding it, then make sure that shit is secure, or you'll be explaining to the neighbors why there is a metal pipe that stinks of sulpher in their yard :P

For sealing the end, JB weld, fucking orgasmic stuff. Of course actual weld is better, but if you don't have the gear it is the next best thing.

PS Sorry for the ranty first post but from your OP it wasnt clear that you were gonna make a BP one, rather than satans cocaine powered one.

Lol, thanks :) looks like i'm gonna be starting this project in about 3 days time when i can gather all the materials needed, mine also is going to be alot more aesthetic than the one in the video :)

Nope, I don't see anything wrong with an unstable organic peroxide exploding inside of a metal pipe.

Yeah this is a horrible idea.

for all your gunsmithing needs (http://www.thehomegunsmith.com)

seamless hydraulic tubing?

eitherway, seams = death

for shit that wont kill you : http://www.cncguns.com/

this!

Well, not for the average joe unfortunately.

12g Shotgun: $100
Box of shells: $10
Not looking mutated by an explosion less than 2 feet from your face: Priceless

holy fucking hell!

was he storing OVER 100g WITH A METAL SPOON?!?!?!

making cartridges with copper!

why is this video not removed yet?!!?

This.

That's why he puts teflon tape on the shotgun shells.

Not only like everyone else said a HE in a copper tube BUT in the video there was snow. So the weather was very cold, making the metal more brittle especially under conditions where it goes cold to hot very fast

I smell bullshit. IF that was indeed AP, his face would be GONE. It would det, not deflagrate.

why did the jackass shoo this indoors? he obviously had a good snowbank outside to shoot into as shown with the glass bottle but for everything else he shoots it in the hallway?

Seconded.
There's no fucking way that was actual AP.
Even flash would have blown that pipe to pieces, not actually worked properly.
And he dropped the spoon or whatever back into the GIANT container of it.
Total bull. But bad to tell people that you can do that.
Ninja Edit: CNCguns is the coolest thing ever.

Dont believe everything you see.