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50/50 mix should work. With 10 hens, 50 lbs should last a long time. 50 lbs is the way to go...it cost only about twice as much as a 5 lb bag.

Eggs shells MIGHT have enough supplemental calcium if you give your hens layer feed with calcium in it. If you give them all flock, I'd go with oyster shell - you need to remember, if you're only putting back what comes out (calcium-wise), you're losing calcium, since no animal is 100% efficient...