All slingshot guns have a high range due to zero friction barrels and no energy is wasted in using a ram. There is a group (link below) just for slingshot guns. Personally, having built several of them, my favourites are the SR-V2 and the T36, although I haven't built some of the others like the A.D.U bazooka 1040. Hope this helped! http://www.instructables.com/group/SlingSHknexgun/?show=INSTRUCTABLES&sort=POPULAR&limit=20&layout=images
Like Lowney said the slingshot guns are the most powerfull, but I think that KILLERK's SR-v2 is the most powerful, he said he got it to shoot OVER 400 FEET!!!
No really, I posted the SR-V2 instructions and I could get it to about 500ft (probable about 450ftish though) and when I am done filming the range I will add it to the video currently on the page.
imagine making a turrest SR V3 - like the normal sniper but twice as long, and mounter on a stuck down quad-pod! a quad-pod is a tripod, or a bipod with 4 legs.
Well my I know how long my gran's road is (about 700ft) so I can film me shooting down it. It should be fairly easy to see if it has reached 500ft or not.
Well, they are very rare, and most of them use a lot of pieces because they depend on a long stretch of rubberband, but i think slingshot is the correct answer to this one. I counted it and there are only 17 slingshots on Ibles. Have fun though, they are crazy when it comes to range!
Bio:15 years old, born in and still living in Washington, Sophomore in High school, A+ student, hate history and writing. Always trying to make things simpler.
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Hope this helped!
http://www.instructables.com/group/SlingSHknexgun/?show=INSTRUCTABLES&sort=POPULAR&limit=20&layout=images
http://www.instructables.com/answers/What-is-this-2/