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High power questions

Posted: Sat Oct 13, 2007 9:41 pm
by NewB
I want to make a high powered 223 cal. gun and I have some questions.
What type of pipe should I use?
What type of valve should I use?

I would like the barrel to be thick enough so that I can have it rifled over at Gander Mt.

If I could have some help that would be great. :)

Posted: Sat Oct 13, 2007 9:46 pm
by SpudUke5
I guarantee you if you would look around, you would find your information needed. Or if you cant, then pm a person whp would know, but not me :)

Posted: Sat Oct 13, 2007 9:57 pm
by NewB

Posted: Sat Oct 13, 2007 10:06 pm
by DYI
If you want this to be .223 calibre and "high powered", you're going to need a lot more than 300 psi. To force a solid (non vegetable) projectile throught rifling in such a small calibre, you may need thousands of psi.

As for pipes and valves, you want the strongest and biggest pipes and the strongest, fastest, and biggest valve you can afford.

Posted: Sun Oct 14, 2007 12:54 am
by BC Pneumatics
Rifling will tear out of a plastic pipe (obviously), and you are unlikely to find a pipe that is the perfect fit for a .223 round. It would be cheaper to have the end of a standard .223 barrel threaded to attach to your system than to get a custom barrel bored and rifled.
I agree that a powerful air source will be required to push the bullet through the rifling. Perhaps you would look into building a .22 air rifle, that uses standard .22 air rifle rounds? I have a feeling this will be much more practical.

Posted: Sun Oct 14, 2007 9:04 am
by NewB
Would that shock pump connect to a tire valve and be able to fire the .22 air rifle round at a high velocity?

Posted: Sun Oct 14, 2007 9:12 am
by jackssmirkingrevenge
NewB wrote:Would that shock pump connect to a tire valve and be able to fire the .22 air rifle round at a high velocity?
Using a shock pump as an air source I've taken 0.22 airgun pellets beyond 700 feet per second in my 6mm pneumatics. Using 0.177 pellets in a smaller barrel will yield lower energies but higher muzzle velocities.

Posted: Sun Oct 14, 2007 10:31 am
by NewB
Does the shock pump connect to a tire valve?
Also would I need to make a piston or is their a metal sprinkler valve that I could use and would a blowgun be be strong enough to use as a pilot valve?

Posted: Sun Oct 14, 2007 11:30 am
by jackssmirkingrevenge
Does the shock pump connect to a tire valve?
Yes, you can use an ordinary schrader tyre valve.
Also would I need to make a piston or is their a metal sprinkler valve that I could use and would a blowgun be be strong enough to use as a pilot valve?
You can use a metal quick exhaust valve as these are normally rated to higher pressures than sprinkler valves and yes, blowguns have been used as pilots for high pressure pneumatics.

Posted: Sun Oct 14, 2007 1:59 pm
by NewB
Would it be safe to use a metal quick exhaust valve and blowgun at 300 psi?

Posted: Sun Oct 14, 2007 3:23 pm
by veginator
It depends on what they are rated to if you try that with the first qev you can find you will have a very expensive burst disk on your hands so do some researching before you do anything.

Posted: Sun Oct 14, 2007 5:41 pm
by NewB
Where can I find a quick-exhaust valve that can hold 300 psi?
I can only find up to 150psi.

Posted: Sun Oct 14, 2007 6:48 pm
by DYI
Most QEVs are only rated for 150 psi. Just make your own. It will be cheaper.

Posted: Sun Oct 14, 2007 7:01 pm
by NewB

Posted: Mon Oct 15, 2007 10:35 am
by Brian the brain
Yep.If there were 300 psi quick exhausts we wouldn't be using the 150 psi ones now would we..

Wow..just imaginge a 900 psi / 2" QEV...
Well whatever..
Why try and find a pipe that fit;s the ammo??
It's so much easier the other way around...