Berry's says to use jacketed data, but to stay below 1200 FPS. I think they are concerned about core separation. A speed limit like that favors heavier bullets to get maximum power factor and energy, since they can be pushed as fast as lighter bullets. At the other end, plated bullets will stick at low loading levels that that are useable with lead. It takes higher velocities to get accuracy with plated bullets than with soft lead bullets. I stuck a Rainier plated WC one inch from the end of a 6 inch M14 barrel. It was very difficult to get unstuck. I was using a light charge of WW231. TSquared's info about the 10% reduction in speed compared to lead is interesting. I don't have a crono, and have long wondered how much speed was lost. One problem with loading plated bullets is that there is very little published data specific to them. I shoot at an indoor range, which doesn't allow plain lead. They go over the ammo with a magnet. No steel either.
Rick
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