On Sunday, September 29, 2019 at 10:59:00 AM UTC-7, Bob La Londe wrote:

I wonder if it would be worth it to use a venturri at the nozzle to
increase air volume.

Yes, and if you can tap the compressor tank BEFORE the regulator, it certainly
will be more efficient. The high airspeed from full pressure air is not
required, but throttling the pressure is a waste of energy/compressor
power. It'll be a trifle noisy, though; consider earplugs.

Lots of airguns use venturis (venturae?) anyhow, you might just find a suitable
nozzle off-the-shelf.