Fifty Caliber Shooters Association (Fcsa) - 1000 Yard Rifle Matches 50bmg Erl, Very High Power Magaz, The Fifty Caliber Shooters Assn., Inc. (FCSA™) was established in 1985 Our primary sport at this time is 1000 yard shooting competition with a mission to advance the art of extreme long-range accuracy with the fifty caliber rifle.