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I've called in spikes and cows w/bugles and cow calls.
I have good luck finding them. Getting a shot is another story. I usually find them, they bark at me and I see bodies flying by. Perfect if I was shooting a shotgun with buck shot. Not good with the bow.
Last year I called in a couple spikes to 15 yards. I got in place an hour before light. Started calling 30 min before sunrise. And called for an hour and a half after sunrise. They came in just as I was about to leave. I didn't do any bugles, just cow mews, and a few lost cow mews. They B lined strait at me, and weren't even cautious in the slightest.