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If you correctly engineer two items, one from cast iron and one from aluminum, its a really good bet the cast iron one will last longer than the aluminum one many times over....
Of course there are situations where cast iron wouldn't be the right material, just like there are situations where aluminum would be a bad choice as well. Without knowing the specific alloy, you really cant say how brittle it is, because there are malleable cast irons out there....
But when you are talking about a lee turret press, saying the cast iron version is weaker than the aluminum version is simply not true.
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