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Here's a QuickLOAD analysis of a 223 loaded with a 40 gr V-Max at ADI's max recommended load. I just plucked this from ADI, it's not my pet 223 load, although its close to it.

165090

The graph...

Here’s article from Accurate Shooter on the topic Twist versus Velocities.

How Muzzle Velocity Changes with Different Barrel Twist Rates « Daily Bulletin

And here’s Frank Green's (co-owner...