OK!
I found the forum, I braided myself a sling , I went out and came back soon after with bleeding fingers, I did'nt give up and soon got back into that lost groove and found that I could comfortably lob a fair sized stone about 120m out into the Med. Every now and again I would let rip and the only difference would be that the stone would do the same distance but with an almost horizontal trajectory as opposed to the usual 40 deg or so launch and loopy path. But 500m!!
....wow! I dont know how it is possible. I dont know much about the dynamics of sling construction but I'm sure I can improve my distance with a " slinkyer sling" that has less air resistance and so on...but 500m??! Wow.
Hats off to anyone who can do 250 nevermind 500m
The gauntlet has been layed so to speak and I aim to crack 200m asap
I think the guy was slinging downhill with a tailwind