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1. sizing a cast bullet "down" to jacketed diameter will, supposedly give you an inaccurate cast bullet.
2. no matter how "hard" the cast bullet, it's softer than a jacketed bullet of same caliber.
3. Lead bullets will upset, usually, to seal the bore, otherwise subject to gas cutting and corresponding problems (leading and lousy accuracy)
4. Coefficient of friction is different,
lubricated lead bullets move more easily, through the barrel than do jacketed types.
5. Re the accuracy comparison you mentioned, maybe yours does, every gun is different. you might take anothewr look at your lead bullet loads. Also, you didn't mention, what weight/shape lead or jacketed bullets.
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