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Brasshopper; you must have been associating with some interesting people to have acquired the ideas you posted. Have you been going to HCI meetings for the free food?
The idea of lead bullets 'galling' in the brass case is not true. A primed case, with no powder, will send a .357 158gr. lead bullet all the way down into the forcing cone. You have to crimp, HEAVILY crimp .357 and .44 Mag lead bullet loads. Otherwise, you get the bullets creeping forward with recoil, and get uneven accuracy due to differences in 'bullet pull', the amount of force necessary to start the bullet moving.
Jacketed bullets require more force to engrave the rifling on them, and have a higher coefficient of friction than a properly lubricated lead bullet. Thus, jacketed bullets will, in general, all other things being equal, generate more pressure than lead bullets of the same design and weight. This difference may or may not be significant, depending on the caliber and load. With maximum or near maximum loads, prudence dictates REDUCING powder charge with ANY change in components. Walt
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