Sling shooting, either Match Rifle or Palma, is very different from F-Class, particularly F-Open. The sling shooter has a variety of parameters that must be juggled simultaneously. These include: breathing, position, hold, changing focus from the spotting scope to the sight and vice versa, sight picture, trigger control, windage clicks, etc. It is a true testament that shooters post the impressive scores commonly seen at tournaments. [br]
When I am shooting F-Open, I almost never think about my rifle unless to click 1/8 MOA for elevation and reposition on the rest after a shot. Otherwise, all my focus is on the target, mirage and flags. Unless the conditions are horrible, I do not use a spotting scope. The rifle has a 2 ounce trigger. When shooting well, all my shots are in a rectangle shorter than the X ring and within the 10 ring (or close) horizontally. That precision is not reasonable to expect from a sling position. So, the answer is no, I don't think a top sling shooter could be competitive, regardless of cartridge. That doesn't mean much because the two are completely different approaches to the same problem and each have a lot to recommend them. The F-Class target is right for that game, not for sling.