F-Class is prone centerfire rifle. There is no national sanctioning body for it like in benchrest. It seems to be a name you call something when a bunch of people want to get together and shoot a while. The NRA published some rules for about 5 or 6 different variations of F-class which include short range, medium and long range and then Palma style (what we did).
If you go to the NRA webste and then click on High Power you will find F-Class rules about halfway in.
The Palma style is exactly what I wanted because you shoot at 800, 900 and 1000 yards and there is unlimited sighters at 800 and then 15 rounds for score and 2 sighters and 15 rounds for score at 900 and 1000. This adds up to shooting about 50 rounds so you get a really good opportunity to try different techniques and reads on the wind.
You can use bipods or backpacks or full benchrests for your gun. There is a class for 308s and 223s that is kind of a factory class kind of thing.
Yesterday, every bullet would have been a good hit on an elk but only about 75% or less would have been good hits on an antelope. Which only proves the point that I need the practice.