SpudFiles

It's going to end up being a manometric high pressure gun. I'll need to find replacements for burst disks, because at the moment, I'll have to go through about 10 soda cans haha.

I might look into thick sheet metal, where only one piece is required.
Managing 20 soda can cutouts would be a real pain!

Somehow, I doubt you would need 10 can cutouts.

I assume the nipples are sch80 or higher?

You're right, more like 20
It's all sch 80 forged steel (except for fueling, metering, etc)

In HGDT: With a 10x mix, 200psi burst disks give me 1000 fps for a lead projectile. The same mix and projectile, but with a 300psi burst disk, I get 1200fps.

The more burning I get to happen in the chamber before the disks rupture, the more energy is transferred to the projectile.

I'm looking into 14 gauge aluminum sheet metal as a burst disk.

In HGDT: With a 10x mix, 200psi burst disks give me 1000 fps for a lead projectile. The same mix and projectile, but with a 300psi burst disk, I get 1200fps.

Don't bother with 10x mixes unless the disk is bursting 600PSI+ in my opinion. Drop the mix, keep the burst pressure the same and the velocity is probably quite similar.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

A 6x mix gave me 600 more fps, compared to an incomplete 10x burn.
I'll either use tin cooking pans, or 14 gauge sheet metal. Trying to get a burst pressure at 700-1000