The 700 yd reference was ONLY for scouting. Of COURSE I think you need to get closer to set up.....UNLESS you're set up in an area you KNOW they're traveling on.

If the latter is the case....you may not HAVE to be a great caller. My cousin once told me something about duck calling...but I think it mirrors turkey calling. He said:

"The secret to being a good caller......is being where they want to come"

Look at it, that way. If you can make JUST enough noise to make them notice your deke(s)........you shoud be set.

Good luck!