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“I would look at hydraulics reshaping the bullet before dieseling. Rifling displaces lead, lead displaces lube, lube has to go somewhere. It’s going to push back on the lead and on the gas check. The result is a longer thinner cast bullet.”
Agree with HangFire. I’ve found that lubed cast bullets, even a very low velocity under 1000 fps, all are .002 – .005″ under groove diameter even when .001 – .003″ over groove diameter before firing. The low end velocities create much less heat and pressure yet the effect is the same….the bullets are undersize. Can only be from the hydraulics of the lube between the bullet and bore surface.