Hello again.
    This has most likely been touched upon before, but I didn't spot it. That being said, it could be right in front of my face.
     How big is the trade-off between power and accuracy?  I am trying to work on my marksmanship skills, and finding my more powerful throws are way off the mark, and my lightest are hitting reasonably well.
     How long does it take to put the huge, injury-inducing, big-splash-in-the-lake-causing, Water-melon-didn't-stand-a-chance, Rule 6 type power into a reasonably accurate shot?  It has to be possible, or the sling would not have been useful as an ancient weapon for hunting anything tougher than a mouse, but I can't seem to reliably hit a mark at more than about half power.
    For those who will ask: My usual sling, 1 meter long folded, Balearic,  smooth, perfectly shaped stones between one and four ounces (30-120g). Range 60 feet.

I'm far for both accuracy and power, but from what I've read here and there, power will come along with accuracy, when your form will be close to perfect, you will be able to power up you shots without messing them.

yes. Quote:
I agree with Caldou. he has a good point. however. you can go fairly high up the power rank if you work hard and practice a lot. i often pick a target, and i can hit a telephone pole from nearly 20 meters away with around 80% accuracy slinging with about half power. However, if i sling at full power, then i literally cannot hit the wall in front of me.

The topic has been brought up many times but in that we always have a high turnover of members that's fine.  Many of us have found that if we sling at approximately 80% of our full power our accuracy is good and there's not a big drop off in projectile velocity.  In fact, often by not slinging with all of our might our shot is more powerful because our form is better and our muscles aren't all tensed up.  Using perfect form, using your entire body, twisting at the hips, and being loose and relaxed are much more effective than trying to do it all with arm strength.

As Rat Man said, usually 70-80% power is standard for sligning target slinging.

AS Bill said, even half power would still leave a mark (understatement).

90% power from a long time slinger is very impressive and would be very lethal on the ancient battlefield.

And 100% power is Terrifing, espically from a novice slinger.   

Sling naturally. Your mind will make the calculation as to how hard you need to throw.

I can hit a garage door (3m x 2.5m) from 80 - 100m away, using 70 - 80g projectiles, with about 70 - 80% accuracy. That uses about 80% of my potential power.

Lately though, i struggle to hit targets (50 x 75cm) that are 40m away. Don't know why.

I tried getting it on video, but everytime i focus on getting it right on video, i over focus and overthink the shot and end up looking like i took up the sling yesterday.

We,slingers know that 80% of power is extremely subjective.
Slinging relaxed,smoothly,fluid,fast with good form can give both accuracy and power. What you train with,that's what's going to be your best. I've been always slinging with most of my power,speed and that's what i'm the most accurate with.

short sling-pistol,long sling-rifle