If your gun came with 3 chokes they would probably be: IC, Mod, and Full. In that case go with IC.
If your gun came with 5 chokes then you would probably have: Cyl, IC, Mod, IM, & F. Go with either Cyl or IC in that case with #8's. If you are using #7.5 then go with IC.
The ideal choke for Skeet is in between Cyl (.00") and IC (.10") which is the Skeet Choke with a constriction of .05" but, if you don't already have one then either of the above mentioned chokes would be fine.
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