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Every .357 mag round I have shot i have never seen them crimped. So is it needed to crimp this round?
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I'm sure every factory .357 Magnum has a crimp and anyone who knows what they are doing will crimp reloads. I have a feeling they were all crimped, you just didn't recognize what you were seeing. Slow powders associated with .357 Magnum loads need a firm crimp to ignite correctly and if you don't crimp you run the risk of bullet pull. (especially with stout recoil)