I just may have found it. The perfect projectile. A student of mine somehow acquired this polished piece of steel. It weighs just under a pound, is as smooth as silk. It's perfect save two small details which are revealed in the fact that I haven't slung it yet. Here's why: 1. I'm afraid to lose it as it would certainly go farther than anything I've ever thrown. 2. I'm a bit afraid of what it might do. I found an academic paper on slinging recently that had calculated the terminal velocity for sling projectiles on level ground at 128 ft/sec...which translates to...87 mph... which seems low, I'll have to read it more carefully, but in any case, I personally am not interested in the a fore mentioned ball of steel hitting anything except a large pile of dirt wherein which I can find it... and not be found guilty of reckless endangerment. So the only major problem with this projectile?...It's too nice, too expensive, too rare... It'd be like having a vintage Porche 911, who'd wanna drive it? Just a tad too perfect...
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slinging steel...what else?