Remington 1100 youth gun

[cont520]

I am building a 20 gauge for my boys to strictly turkey hunt with. I am curious where to start chock and shot combo wise with a 1100 21"barrel youth gun? I have never messed with 20 gauges so I dont really know where to begin. 

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Indian Creek .555 choke with Hevi Shot 3 inch 7s.

[cont520]

Thankyou sir