Thanks for clearing that up. That's actually quite surprising. My Nitro Duck X-Stream should work just fine then (in theory). It's flow rate is high enough to not starve any of my RT's and it is externally adjustable.
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I'm going to air up my capped valve pump when I get home. I believe AThomas' numbers but swear mine is running closer to 600to the valve. I might be mistaken though. I do remember when I was running it on 12ies and had the valve devolumized that it was running even higher to get FPS in the correct range.
Timmy J was running his straight from an adjustable tank reg. As long as its adjustable enough and consistent enough an adjustable tank reg will work.
I aired up on my capped pump and am currently running about 540psi and a little hot. Shots are in the 285-294 range. On my way back out, so I can do some more checking later if needed. Level 7 bolt, freak bored barrel and I don't really underbore.