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if you don't "hit it lucky" and get a hot spot, you'll come nearer getting your limit by going alone with your decoys. That sounds counter-intuitive, but I've found it to be so.

Accurate observation. Winter dove concentrations are very much a crap shoot, but I have had good luck walking up singles in the desert. Long shots, lots of work, but can be productive. Use a light gun with tight chokes and 7-1/2 or 6 shot.