Thanks to Klickitat for pointing out that the relationship between powder and pressure isn't always linear! He's right on and it needs repeating> A TINY INCREASE IN POWDER CAN CREATE A GREAT INCREASE IN PRESSURE.
Somebody out there maybe wants to gamble their eyesight, face or hands, but like Yogi Berra said " Include me out"

I saw the leftovers of one gun blown up at shotgun pressures- wan't pretty, and the surgery needed to patch the damaged hand wasn't pretty either.

Art in Wyoming (just my 2 cents)