To be fair Wash, he essentially said changing the twist rate will change the pressure and require a different gas port. Not that the gas port changes the twist rate. I guess the theory is a tighter twist causes more friction equating to a slightly slower moving projectile and allowing more dwell time? Not sure I buy it, but that's all I can figure for how it would affect it. You'll see bigger velocity differences in your loads than you would from the twist rate I would imagine. That might be a nice comparison test though. Same load through different twist rates ...checking velocities. Lighter loads are going to need a bigger port, hot loads may be fine where you're at. You'll have to decide what you want to feed it. The hot loads may be a little harsher on the system, but at least it'll eat the light stuff.