Pressure is related to velocity, but is is not a direct relationship. More pressure does not always produce more velocity. The peak pressure occurs before the shot has moved about 1/16 of an inch. By the time the wad clears the end of the hull, pressure is dropping very rapidly. Recoil is a result of the rate of acceleration of the shot.
JerryP, I've been thinking about your post as I drove home. My initial conclusion was [email protected] = LR , then I read some other posts and realized that this is impossible. HV must always = MR. Go figure, I give up as you have just disproved all the laws of physics.Or was it "proved".