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Thanks for the replies people. I'm using a 1-4x nikon african scope. The velocities are chonographed. I have considered the barrel rise assuming it acts like a ridgid rod. In that event the effect is too small and also in the wrong direction - the heavier load would make the barrel rise more and hence hit higher. In practice it is the light load which is high. I suspect the problem is that the barrel bends like a fly rod - which would make the heavy bullets lower. This is a harder calculation and I haven't finished it yet. My intuition is that for a barrel as heavy as this one the bend would not be enough, but I'm not sure. This is a very interesting physics problem. If we ever figure it out I may have to give it to some of my students!
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