inonickname wrote:I think that if you want to do this custom ammo is the way. I don't believe you need perfect airtightness, just higher inlet than leakage, but still enough to drop flow enough to allow another round into the breech.
Indeed, it would work without a seal in most cases. The thing is that for the small chambers, you'd probably need tiny flow for pop-pop-pop sort of firing so if you want a low rate of fire, the seal would need to be included.
I think a good ammo for this would be to use telescoping tube for the barrel, then get the next (lower) size. Cast some of whatever (a glue) into the pipe, chop it into whatever lengths with a razor saw and mitre box, then a quick pass with a belt sander to finish them off.
This is pretty much what Hotwired was talking about, however as I said for various reasons not worth it in my book.
Or you could just use rod...
... and what better ready made pre-sharpened rods than headless nails
completely unstable in flight, but at point blank range it wouldn't matter...
Oh dear, look what you've got me thinking!
When I get home I'll knock the heads off a few wall nails and see how far they fly straight from my pengun V2 and what sort of damage they can do at 400 psi, this looks like it could be interesting
edit: following some
testing, while it would be cool at point blank range it doesn't seem to be worth pursuing.