I'm looking to put together a tripod setup for rifle shooting using both a saddle-type mount and Arca-Swiss plates. I've got a lot of experience with tripods for photography, and currently have an older Gitzo 340 (two-section aluminum legs; no center column) with an Arca-Swiss B1 ballhead on it which should be sufficient for any rifle, but I've also seen some setups that dispense with the ball-head altogether and utilize leveling bases in the 70-75mm bowl mounts typically used for video equipment. That looks like an interesting option to keep the center of gravity closer to the tripod. What's everyone using and why?