I've never played with reduced loads for jacketed bullets, but have shot a few cast ones. My thoughts are, cast lead either greased or powder coated has a high degree of lubricity (slipperyness) so the bullet gets easily pushed down the bore by even a small charge. A copper jacket is much harder and far less slippery so with a charge required to go subsonic is there a chance of a stuck projectile?
Apart from that you'll get no expansion from something designed to open up at over 2000 fps whereas lead will probably give you a bit of expanson. Someone who uses std jacketed bullets in this application may like to comment and put me straight if needed
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