From the FAQ on the boss site.
Q. WHAT MAKES YOUR BISMUTH BETTER THAN OTHER BISMUTH LOADS?
A. By surrounding our bismuth with a thin layer of copper, there’s significantly less pellet fragmentation vs. unplated bismuth. Copper plating also lessens pellet drag when entering the meat. This gives you 15% better shot penetration for quicker, cleaner, more ethical kills.
Q. WHY IS BISMUTH BETTER THAN STEEL?
A. With bismuth weighing in at a massive 9.6 g/cc vs. steel at a mere 7.8, bismuth just smashes harder. It also penetrates deeper—and both factors help significantly decrease crippling.
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