Bullet cannelure tool

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Glocktogo

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Agree with Shadowrider, plated bullets act much more like swaged lead bullets with a low BHN (usually around 10 BHN, give or take a couple of points). That's fine for target velocity levels and you can roll crimp directly into them, but that may affect accuracy negatively and not be worth the effort. Unfortunately the plating makes them slicker, so bullet pull is tough to manage with a light roll crimp and a heavy one will definitely deform the bullet.

I used to have a Corbin bullet cannelure tool and it worked quite well for my esoteric purposes (I roll crimped 150gr .356 FMJ's for use in .38 Spl). I've since sold it, so I couldn't help with an experiment.
 

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