I have recently become involved in one of the best martial arts I could ever imagine for a slinger such as I/we am/are
! It is called "Goong Do", and is the longest-range ancient classical Asian martial art still practiced regularly to my knowledge.
What struck me immediately, in terms of its structure, was the fact that it not only includes a great 145metre/159-yard target competition, but also a "Gichin Funikoshi-esque" BELT RANKING SYSTEM based on how many targets a person can hit out of 40 arrows (and not too different from the old Spanish-Balearic system of hitting all of the slats on a gate as a way of testing combat readiness/SQT level), limited to increasing a maximum of two dan ranks MAXIMUM per year. This seems to strike a good, and practical balance to insure the combined skill, participation and dedication to the sport by its students on a large scale.
I think it would be a worthwhile endeaver to perhaps try out setting up a formalized slinging art system based on similar criteria. I just made my first hit on the 145m target on my tenth attempt on the first day I was allowed to shoot live arrows, and it wasn't easy AT ALL, and luck could have played a large factor, as well as intuition and a lot of experience using Western bows, and similar hand-eye marksmanship skills such as slinging, firearms and knife-throwing. I was also impressed with the equipment used in these competitions. The Mongolian-Turkish composite bows are STILL by FAR the finest bows in the world, and the Korean version is the shortest, lightest of this type, for the same draw weight/power in use today.
The longest Olympic range for a wester-style bow competition is 70m, and the longest Western competition PERIOD 90 m for point-type targets. Even modern MONGOLS only shoot to about 70m, but the Koreans DOUBLE that range! Only some reported balearic slinging using AREA-type targets such as swimming pools surpasses that for distance.
I think that this model would be a GREAT one for long-distance slingers to adopt. It could even be adjusted to shorter-range competitions, and even to quasi-"tactical" speed slinging! Also, there are many possiblilties to learn from other successful martial arts and sporting formats from paintball competitions to combat pistol competitions.
I've even thought of starting a "Benjamin Society", or club consisting of people dedicated to learning to AMBIDEXTROUSLY shoot the VERY compact, lightweight and powerful composite bow AND sling at various ranges, and under various simulated combative conditions, as a form of extreme quasi-historical sport based on the old biblical legends. I'm not very religious, but it just sounds like a lot of romanticised fun! If I can find a few interested friends to start this society, I think I may experiment with the above-mentioned format and variations on this theme as a basis for training, structure and competition.