I've never known grunt calls to actually "call" a deer. In my limited experience with them, I noticed that it simply relaxes a deer's guard, making them think they are safe, so they wander closer to you as they forage, or makes them feel safer about venturing out into a clearing. I really don't know if there is a rule about how often to use it, but I have grunted two or three times every ten minutes or so, or if I see a doe thinking about coming out of the woods into a clearing.
As for doe calls, it does get bucks interested during rut--so I hear. I've never used one.
I never used a rattle-bag either.
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Deo Vindice
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