I don't necessarily like to assign a percentage value on specific hunting methods so I won't go there. However, based upon my approach ambushing almost always coincides with some degree of calling; it's not simply setting up in a spot and waiting for a bird to walk by. The idea is to substantially increase the odds that a call will be responded to in the manner that you want - a bird well under 15 yards! A lot of what I do depends on when my season falls and how the stages of the "turkey rut" are progressing. Hens call the shots a lot of the time, especially when I am hunting mature toms, or as my buddy Gene Wensel calls them "herdbulls":^) Consistantly taking trophy longbeards takes a knowledge of their habits and habitat plus as many weapons as possible in your bag of tricks. Sometimes you have to "hunt" the hot hens; you need to figure out where they're roosting AND most likely to head at fly-down. There are certain times of the season when no amount of "fancy" calling will bring a big boy within bow range. If a hunter can't find a way to get between him and his sweetie or beat her to a pinch point they're likely to pass through, well, the show might be over. I don't care if you can call like Ben Rogers Lee (For you old time veteran turkey hunters who remember:^)), he's not going to give up a sure thing to run to you. Yes, there are occasions when birds literally sprint across fielsd to decoys like love sick tweetie birds but that rarely happens in my neck of the woods - especially during the times I hunt and once again if I am targeting the biggest longbeards in the woods, my MO for the past several years. As far as calling technigues are concerned I have to say that I have had more consistant success using methods where you don't have to sound like a championship caller (Sorry Outdoor Channel fans). For example,things like slapping your hand on your thigh to simulate flapping winds, scratching in the leaves, using your own mouth to purr or spit and drum can be very effective. In fact, I have pulled hot hens past me by making simple scratching and feeding sounds without the aide of any commercial calls. Bottom line, I don't panic if I get out of the truck and discover that my slate or mouth call is in another pocket at home. Somedays that may actually be a good thing;^)
Sometime I may do a post on how to call turkeys across a field with a rod n reel and set of practice plugs. Just like trolling. No joke, there's a time and place where it's absolutely DEADLY.