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WOW, I'd have to see that. My Steel cores will turn a cylinder block, into dust at 100yds. Not only that, but you have to go straight into the berm as they can fly into the next county. I can understand why a range would want to discourage this round. Perhaps they need to identify them by brand names rather than just the magnet test. ...
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I have turned cast iron cylinder blocks "to dust" with a .357 and cheap bulk bullets. I have also seen the same happen (with an International 304 block) with a .44 Mag and hard-cast lead SWCs. No steel-core bullet or rifle cartridge was required. Engine cylinder blocks (iron or aluminum) are much more fragile than most people believe. Brake master cylinders, on the other hand... They're tough cookies to crack.