a 40mm projectile at a decent speed? Any tips or input?

What's the projectile (weight, shape) and what speed would you consider decent?

For speeds I was hoping about 150 fps over 50m.

10/32 is like 5mm, no where near enough flow Yes, this sort of QEV is more of a control valve for paintball markers, not really useful as a main valve. a 40mm projectile at a decent speed? Any tips or input? What's the projectile (weight, shape) and what speed would you consider decent? Im planning...

10/32 is like 5mm, no where near enough flow :shock: your'e gonna need a BIG QEV, A 1/2" at least https://www.ebay.ca/itm/QE-04-Pneumatic-Air-Flow-Quick-Exhaust-Valve-1-2/173237420827?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20180124162230%26meid%3D5a3c056e909149bf8fae685fa309f6f0%2...

Ok so, I'm new to this. I'm making a project that shoots a 40mm projectile out of a 9" barrel. I'm thinking of using this 10-32 QEV: https://palmerspursuit.com/products/qev-10-32?variant=12132702855 I'm using a 16g co2 reg'ed down to ~300psi into a 3" 1/4 nipple. I'm wondering if this would provide ...