Can anyone tell me the procedure or format for the F class shoots.

Like how many rounds you need,what is the time limit allowed,etc..

I also here some shoot prone with front and rear rest as well as the
same on the bench..Why do some shoot off the bench? Is there a
reason behind this madness?

What distance are they held.I heard someone say 250 yards? So
if you want can you please shed some info. on this...I am
thinking of trying it myself..I used to do the black powder cartridge
game but am getting away from it to something more easy
and where you can use a scope as well..John