Hello Zorro,
As you know here in Spain the federations of each sport that it controls the operation of each one of the sports exist that here are practiced.
The Balearic Federation of Shot with Sling, is the one that regulates and it controls this sport, and I am a judge and referee of that federation, likewise this federation takes a registration of the records obtained by the slingers.
In accordance with the norms of this federation, in the competitions, rushes for categories, Men, Women and Children / girls, the children/girls when turning 14 years passes to the superior category
It is thrown to make aim on a square that has a reveille in the center and it is punctuated according to himself inpacte in the square or in the reveille.
Likewise we organize competitions that we call of "long distance", in this competition type there is not reveille where to make aim, we only measure the distance that there are between the slinger and the point where it is detained the stone.
Said all this, I respond your questions:
I it there to world record properly measured? Yes we have a registration of all the distances reached by the slingers, and the current record is established in 600 feet (183 mts)
who? Of course the Federation Belear of Shot with sling
when? In each one of the competitions that take place
where?In the corresponding books of record
what kind of sling and projectile? I have already mentioned previously it, they can be all less those made with synthetic materials (rubber, plastics or derivates) or materials of mineral or metallic origin, and the projectiles are stones to pleasure of slinger that usually weigh between the 100 and 250 grs.
what wind speed and direction? The wind is usually in calm, and if there is, we don't measure it
After explaining all the above-mentioned, I can guarantee and to affirm that throwing with the conditions that I have commented and with arrangement to our regulation, to reach same distances or superiors to 200/250 meters is unthinkable
Greetings,
Vicente
P.D.: Zorro, since you are Spanish, it visits our web page
http://www.tirdefona.com and for sure you found information that will be you of utility.
If you know there is somebody that this willing one to translate our regulation Spanish to English I can send it, it is translated, saved to a file PDF and we can distribute it to who wants it.