I do not take shots on running deer over 75 yards away with a slug gun. A hands-free call is great to get a buck or doe stop running for that half second to take a good shot. The dominant buck contact call works best for me in this situation.
Calls can also work great to call in deer. Be aware that if you use a dominant buck call for general calling you may scare away any non-dominant bucks in the area. If you discover that your mock scrape has been totally redone, you have ticked off a dominant buck in the area. I did this to a buck several years ago. He tore up the ground about 5 to 6 feet long and 1 1/2 feet wide. I was able to call him in with a dominant buck call, but I did not get a shot as a large branch was in the flight path.