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Does anyone know if any particular kind of slingshot ammo is illegal in any particular jurisdiction?

Not crazy stuff like exploding ammo or depleted uranium, but conventional ammunition.

The reason I ask is, I can give slingshot ammo interesting flight characteristics.

If I can consistently determine which part of the ammo hits first, it wouldn't be hard to make expanders or tumblers.



Fin-stabilised 20gr sinker at 5' with theraband silver.

I won't pretend it's more accurate, but maybe I can advance the German sport of backyard Pudding Plinking.



I bet an expander would stop in a tub of jelly.

At the very least it would give Joerg a couple of minutes of fun.
 

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Discussion Starter · #3 ·
It's not about the speed, but getting the tip to impact consistently. It'd be hard to make expanding ammo if it could impact at any angle. Shot bags and balls of shot mixed in substrates like wax are exceptions, but they have their own issues.

I have to borrow the chrono again, but the dart-balls I made tonight seem to fly as fast and without hinderance. The flights are aerodynamically efficient once straight and level, offering little drag compared to the sinker. The only purpose is to make it travel with the tip forward.

I made better versions years ago when I was experimenting with spinning shot, but this served for a demo of the concept that I can make odd shapes hit end-on. Smaller flights are better. As are small flights on shafts (thought you have to glue the flights on). I just couldn't be bothered to make them myself to demonstrate the concept and the idea for hollowpoints hit me when I was in a sporting store by the dart section.

I don't want to actually make expanding ammunition unless I am fairly sure I'd not be breaking the law by doing so.
 

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Discussion Starter · #5 ·
Yes, there would be a critical velocity. Joerg was having trouble getting rounds to stop in his gel block. Expansion or tumbling are ways to preserve most of the ballistic efficiency in flight but deliver it on impact. The idea is find a way to make it efficient in the air but inefficient in the medium. Bullets are a bit different to catapult shot. The advantage is bullets fly straight from a rifled barrel. OTOH, you can be more creative in the design of catapult ammo. I have shot odd shapes like screws and lead figurines, which would never work in a rifled barrel. A catapult expanding round could be made with a flared head and a weak base. As long as it is stable in the air and not too inaccurate, it would do the job at short ranges. The art is in optimising all these criteria.
 
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