Without question, I let the bird determine. The more aggressive he gobbles, the more aggressive I am unless I have worked him before and know that he does not respond to aggression. Aggressive calling and lots of gobbling is very pleasing to the senses, but sometimes leads to the gobbler wanting me to come to him. It is a finesse thing for me. I start low and slow , if not working, move to loud and proud, and if still no success, go back to hard to get. It is very hard to gerneralize though because different birds react differently even depending on the day.
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Safe and Happy Hunting!
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