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Old 02-21-2012, 11:57 PM   #1 (permalink)
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Double Barrel shotgun

Ok, so the Mod-85 used blackpowder, is there any reason

(beside horrendous noise, high fps, etc.)

that it shouldn't be used as a propellant in a double barrel shotgun made out of aluminum?

I'm having trouble finding a machine shop that will actually do this.

probably due to a slew of legal issues, but something being illegal never stopped me before...

LoL.

I've been wanting to design a primer based double barrel paintball shotgun and make it happen, any ideas of where to go from here?
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That's interesting... it's got a cat for a recoil pad. Must shoulder kinda awkwardly.

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Old 02-22-2012, 12:38 AM   #2 (permalink)
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The problem is that primers shred paint. The tiny Mod85 paint is a whole lot tougher than .68 cal.

I say this, having shot paint using shotgun primers and ramset cartridges from a flare gun.

I ended up needing a whole lot of wadding to keep the cartridges from shredding the paint. I think a primer powered air piston would be much more effective.
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Old 02-22-2012, 01:03 AM   #3 (permalink)
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While using the shotgun primer, you didn't happen to use the entire charge, did you?

Also, I'm thinking more along the lines of the blow-back-blow-forward design. (As they describe in the Weltman video)

As for the padding, I'd think it would just be better to run it through a small filter that could be in the actual shell.

I would also be mixing my own black powder based on the US Military's recipe in the 1800's.

76% KNo3
14% C
10% S

I drew up a technical drawing *MS Paint*, but I need to actually get the shell manufactured first for some tests.


Maybe I should just use monsterball...
LoL
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Old 02-22-2012, 01:06 AM   #4 (permalink)
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I didn't use any charge at all, the primer was enough to get me to like 250fps or so, IIRC. Nailgun cartridges went faster.
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Old 02-22-2012, 04:30 AM   #5 (permalink)
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I don't know how much experience you have had in blackpowder but if none at all, you might want to research more. Blackpowder is an explosive, not like progressive burning powders. Any gap between powder and projectile can cause big spikes in pressure. It would be worth researching more for your own sake.
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Old 02-24-2012, 03:03 AM   #6 (permalink)
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I have a buddy that has a bunch of pyrodex, I only can assume he knows what he's doing.

In the name of the scientific method,

LET US TEST THIS HYPOTHESIS.

brb
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Old 02-24-2012, 03:15 AM   #7 (permalink)
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guy has explosives, you assume he knows what he's doing.

ahh, the absentee voice of reason
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Old 02-24-2012, 03:59 AM   #8 (permalink)
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Old 02-24-2012, 01:14 PM   #9 (permalink)
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You do know that black powder burns hot right?
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Old 02-24-2012, 01:21 PM   #10 (permalink)
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