Most folks' favorite calls are top secret and made by local injuns.
I have had decent luck with Lohman's #9, and pretty good luck with the ELK, Inc. cow talk and elk talk calls. Some folks like the Kmeer Deer a lot but I never had much use for it.
When it's on, anything will work. When it's not...nothing will. (seems like)
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It's the spending, stupid.