Choke constriction

[Gary Laudermilch]

I read that chart differently than you. Looks to me like .006-.012 is listed for IC which is a pretty broad range. I would think .009-.010 would yield somewhere near IC but it all depends on some other factors like shot size/hardness and payload weight among others.

Here is Briley's chart. While it does not list 16 ga specifically I think you can infer the range for the 16.

[Wilmurt]

Thanks for the correction Gary. I looked at the English, not American designation column. I corrected my original post.