Greydog! Thanks for sharing what you know.
I don't know much about them at all but wondered if they were in use at all in competitive shooting. Sounds like the answer is no. It seems intuitive that pressure would be lower, but I'm not so sure. I would tend to guess that the pressure spike occurs when the bullet has to enter the lands and the bullet is stationary. Friction and initiation of movement of a mass. Once moving and accelerating, that pressure may be lower, but it's likely not the peak. JMO...
