I pretty muchy agree with Dave's analysis. For years my chukar gun was a 12GA. 870 with 26" IC. Then I found myself carrying a 20ga. LW 870, with 23" barrel and modified screw in choke tube--never changed it.
I have a friend who insists on hunting upland game birds like quail, chukar , and sage grouse with his 12Ga. full choke or modified. No amount of discussion will convince him that he handicaps himself 80% of the time with too tight a pattern, just so he'll have that extra range for 20% of the birds.
The 20 modified has about the same pattern density as the 12 IC, although with it's lighter weight, you do have to train yourself to keep swinging.
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