Generally, whitetail are not as vocal as elk or red deer(from what I've seen in videos, no real experience with red deer...yet,) but do respond to calls. I don't leave home without a grunt call during archery season here in NY(or anywhere I would whitetail hunt for that matter). Their calls are are very soft compared to a elk or stag, and do not travel very far, so I don't find them as useful for rifle hunting. You can easily shoot a rifle further than a grunt call can be heard from(150-200yds max on a calm day). They are great for bowhunting though, as they can draw them in that extra bit you need with a archery equipment.
As for using a grunt call, I find they work best when you can see a deer, but they are too far away(again, mostly for archery hunting). Whitetail are very good at pinpointing sound, so you do not want to call to a deer looking at you. Wait for them to start walking or feeding and stop calling as soon as they start to look in your direction.
A fawn bleat can be useful to call in a doe early in the fall when fawns are still fairly small. Fawns usually bleat when in distress, so a doe may come running, so be ready. I don't use a lot of doe bleats but some people use them successfully during the rut. I find buck grunts useful from mid fall on through the rut when whitetails become territorial. I think multiple short grunts work better than long drawn out grunts(like a roar or elk bugle). Some deer will totally ignore grunts and others will stop on a dime, turn around and charge in, so be ready if you are calling. Grunts can be also be useful to stop a walking deer for a shot. Let me know if that makes sense. For what it's worth, the only time I every hear bucks grunting, is when they are actively chasing a doe during the rut. Hope this helps.
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