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I should have said the BASE dimension of the .223 and the .357 mag are similar... the .357 being a rimmed case has a larger "bolt face"
I know this because I have run a number of .357 mag brass into a cut down fireball die for a 22 jet variations that I have a contender carbine in ... and I am using .223 brass in a custom .357 auto chamber for a little high pressure insurance.
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Homeland defense starts at home
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