I am just getting into reloading and my dad had a box of surplus .303 Britishicon from when he was a kid. I was wondering if they are berden or boxer primed. They are stamped K50 and 7. I compared one to a commercial round and the primer on the commercial round was smaller in diameter (as far as I can tell) and the primer on the surplus round looks like it is made of copper and is relatively flat (compared to the curved edges of the commercial ammo primer) so if anybody could tell me if these are berden or boxer primed it would be great. Thanks
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