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In my experience, don't call. They've been hammered with calls for a couple of months now and pretty much assume it's a hunter. I've cow called at a small herd before in November and all they did was run away.
For the modern season I only use a cow call to stop them if they busted me and are heading out. More often then not they will pause to check it out again. Better off not blowing calls all day though. Sent from my iPhone using Tapatalk