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The skeet choke is designed to give the best pattern at the distances you see in skeet, when using #9 shot. There should be no reason to go to a tighter choke unless you are trying to "test" yourself. But the best way to test, or make it more difficult, is to drop down in gauge. The 28 and .410 are quite a challenge.
I find that a skeet choke (5/1000 constriction) works well in 12 ga. For 20, 28 and .410 I'll often just use cylinder bore - it hits plenty hard, and a broken bird is a dead bird - you don't have to see smoke.