For whatever reason, Sperr bullets just don't seem to get much respect. It isn't that anybody badmouths them, but nobody sings their praises, either.
That's both weird and a shame.
They're good bullets - just as good as any others. The Grand Slam used to have a dual core, as mentioned by PJ. They poured in a molten alloy of a somewhat hard alloy, then a front core of very soft lead. I've also heard that today's Grand Slam has just a single alloy, but is still poured in molten.
I'd try a box and if your rifle likes them, I'd have no druthers about using them on game.
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