I can't think of a fixed choke gun I own that I've intentionally openned the choke on other than one gun I've moved the pattern on.
I usually chose a gun to hunt with that I think will be effective for the conditions/game. That does bring choke into consideration. But choke is not the top priority in selecting a gun for a field to me. I select the gun based on environmental and hazard condition first (don't wanna trash a good gun), then gauge, then choke. The reason I put gauge in front of choke is pretty obvious to me. I shoot everything from 12g to 410. On a gale force windy blustery day in So. Dakota, with roosters flushing out pretty far, I'm pretty sure a 12g in about any choke tighter than skeet will be more effective than a .410 with a full choke. I did say "more effective" not reach further with adequate density on a pattern board.
