Lead shot for sure,maybe even try a box of Hevi-shot. The beauty of HS is that it's denser than lead. You can actually use a shot size 2-3 sizes smaller than lead,still have great energy,and have a denser pattern as well. Turkey chokes are usually more than full. If your gun came with a full choke start there.it may pattern well enough for turkeys.If not,look for an extra full or super full. Shots are normally taken at the head and neck area.IIRC 6-8 hits it that area are needed for a clean kill.

I almost forgot. Hevi-shot is like steel in that its very hard. With HS you tend to get tighter patterns than the choke suggests. In my Benneli,I shoot #4 HS for geese,and use a modified choke. In my gun the modified choke acts like a full.
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