n00b question

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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The_Kangsta
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I don't have any experience with pistons, and i was wondering if a tiny 12 cm 6mm barrel would have any usefulness (hitting targets at 40 meters) even at 70 psi or so. The chamber is a 3/4 in pipe, with a blowgun pilot.

So will it work ??
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jackssmirkingrevenge
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Not very useful. At 40 metres, you'd want a couple of feet of barrel length and higher pressures (250+ psi) in order to have a trajectory reasonable enough for aiming at those distances, as well as giving the projectile enough power to do some damage when it eventually gets there.

70psi through a 12cm barrel is little better than an airsoft spring pistol.
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POLAND_SPUD
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what JSR said + keep in mind that 6mm BBs are very light so they lose their energy very fast..... if you want to hit something at 40 m you should choose the heaviest ammo you can get...
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MrCrowley
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And even a drop of wind will put the BB off target by metres. Spherical objects like to curve a lot unless you induce a spin on them to control them. The best way to do this is to add a hop-up to your barrel, it will make the BB raise in flight but it should shoot straight.
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