I am attaching a portion of Hornady's 4th edition loading data for their 200gr bullets both hollow point and the shorter non-hollow point what I like to call solid since it aint hollow. It is not always good to make assumptions but for the sake of this message making a point, I'd like to assume that since both bullets are made by Hornady they would have same diameters and jacket construction and jacket material etc. The same cases and primers and powders are used as well. Take a look at the AA7 and AA9 loads ( the only two that are appropriate in terms of burn speed vs bullet weight ) using the same weight bullet and notice the difference in performance, psi pressures and amount of powder used. As far as I can tell the only reason for loading data differences here is the very small difference in bullet length and the effect on usable case capacity and the resulting effect on bore pressure. What I see is that the shorter bullet has higher velocities because of being able to use more powder because of the lower pressures. This is why I have become so sensitive to bullet length. What other conclusions can be drawn ?