Wow!  

Finally evidence to all the non-believers that slings have superior range.

The only thing I had trouble understanding is ... I am unable to see what the picture is. What is that picture supposed to represent? It looks blurry on the sides, but clear in the centre.. and the centre of the gland looks like some bad fractally-generated 3d-terrain made in Bryce. I'm not saying it's false, just saying how odd your photo is, that it makes me see such strange qualities in it. I am in no doubt that it's real, it just looked so odd. Could be the photography itself.. or something.
Try making a photo of it in an indoor well-lit surrounding.

Yurek, you said you know the approximative points of landing for your lead glandes.  I was wondering if a metal detector would assist you in locating your glandes.

ZaQ,

That place is very difficult terrain for finding glandes but good for slinging and have a shelter for an observer. A metal detector could help, of course, but I don't have that one. There was railway line before, so there is a lot scrap-metal in the ground. Some poeple seek that with metal dedectors.

Mithras,

I molded these glades in the mold made of plaster of paris. The models I rolled of the hot-setting plasticine paste for children. Just a simple but time-consuming technology, require a bit care.

Jurek

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This is my first recovered glande, so I'm not an expert on these deformations. But lead is very soft metal and that undisputed fact explain that kind of damage. The first imapct enegy makes the plastic deformation and heat, so glandes don't bounce immediately but in this short time they slide on concrete (what wipes them and additionally slows down). When the deformation stops (due to lack the kinetic energy), just then the glandes start bouncing but not so very mightly. Just my theory.

This glande was a bit deformed and had a few not large bruises and rasures on the other sides. That one lost almost all dye during the first knock. I heard that knock clearly, so hidden in different positions observers shouldn't have a problem with determination where to start the search for the impact point marked by the peeled dye and lead.

Soon I will do the more accurate testing on the runway.

Jurek

Today I slung the lead glandes on the runway again. Their "injuries" were similar. They didn't bounced far from the impacts points. All ones mostly had the one wide flattering and a few (some 1 or 2) smal razures or bruises. Looks like they "sticks" to the concrete. The surface of the big flat distorsion of some glandes had marks of frication, but some of them were only crushed,  had a texture of the concrete (I think it was glades that I slung more high). I was amazed because one of the glandes didn't lose the paint cover, even the flattered surface has kept the paint but that one was darkened from the high temperature.  Looks like it had sat and stayed in the impact point 

It was really nice slinging, couldn't stop it. Recovered glandes I slung again an again, until I could find no one of them due to dusk. 

I'm very happy because today, first time I noticed that I'm able to sling a granite stone (used them for warm-up) over 400 m!

Happy Jurek 

Jurek,
That is just incredible, four hundred meters with a rock!!
Using a long sling like you do, is more than one revolution required to get up to speed?
Is wind a factor when you are slinging, or is your area fairly calm?
Oscar

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Oscar I know... few mounths ago I thought the same, until I had seen Larry Bray's result from the 1982 year - 437 m.

Most often I make the single initial revolution (sometimes the more, but it doesn't seem to be a big factor) and next the springy lash. Sometimes I use the overhand throw and sometimes more lateral, I'm not decided which of them is more efficient for me, seem to work similar. Yesterday I was slinging not long before the dusk and the wind had calm down after the windy and rather rainy day, so I heard almost the all knocks.

Consider I declared to take the try beating the GW Record this year so I simply must to reach similar ranges No retreat way

A long sling is more difficult for the efficient manage. If one haven't a practice with it, most probably is able to get better results with a shorter one.

Maybe it is incredible, or not. Anyway I have decide to share it here. There isn't any better place for doing it, right? Besides, maybe somewhere there is a guy who thinks - Only 400?! That is  poorly! - Who knows

Jurek

Thank you Ulrica!

Your words make me twice happy!

Jurek

Thank you Hondero too. I would be honoured having you as guest and adviser in my home I have to struggle with my mistakes alone, so all advises are welcomed. But there is a problem with the virtual observation, because I haven't suitable hardware for making digital movies, while we all know that a picture says more than thousands words, especially in my awkward english. I desribed my technique sometime, but no desription can deliver all niuanses, what is even not easy in own native language. I think that I have a bit modified and improved that one and additionally started to use more underhand one during last mounths.

I'm presuming that since David Engval used the lead darts so lead glandes should be premissible with no problems.

When I make the official try I will got some movies and pictures and then will share it.

Jurek

the support team... ehh... old good times