I don't know where you went to FMSS; I was at Pendleton. It was a quarter-inch talcum-like dirt and dust. We had to shoot the M16 prone, and God help you if you kicked up any dust when you got up.....
But yeah, the target was a standard mil-issue target at about 10 yards. It was a waste of time. One of the guys in the platoon bitched that it took him hours to clean a rifle that he shot for less than 10 seconds; he was the only guy to got incentive PT during the entirety of FMSS, our Marine tac (SSGT. Barnard) PT'd the shit out of him. Later in private, some of us told SSGT. Barnard he had a point; it WAS stupid. He said the reason he PT'd the guy was because he called him out in public, but he agreed, and tried to get the fam fire changed to a different program of instruction.
Fam fire and the hours of cleaning weps was one of the things I hated the most about FMSS.