Quote:
Originally Posted by BC38
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Cast lead bullets, being even softer, will achieve even higher velocity for the same bullet weight and powder charge....
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Cast lead can be from dead soft to Brinell hardness in the high 20s. Less friction is the result of the high lubricity of lead over the low lubricity of copper.
In shooting plain cast bullets, harder bullets generally allow higher velocities than softer lead. coatings can replace the lube in groove lubrication of plain cast bullets.