Montana - I don't think shot bounces around within the shot charge. What is the mechanism of shot deformation? I'd say it is the pellet to pellet contact pressure due to acceleration. Other opinions?

t1958 - Interesting that you found little actual difference. Did you find enough to say it is directionally true, or only enough to say the patterns changed (perhaps within statistical limits only)?

JM - this is not intended to be a smart a$$ question. Would you describe what attributes make patters "better" or "pattern beautifully?" I often hear such subjective descriptions and I always wonder what the author bases his opinion on. How does one achieve this "equilibrium?"