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300 yards?

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300 yards?

Unread postAuthor: jon_89 » Wed Jun 18, 2008 11:58 am

I am looking to achieve a distance of about 300 yards. I cant make my mind up of which one to build.
1.combustion: 3x18 inch chamber, 1.5x60 inch barrel, metered propane, fan, and stungun.
2.pnuematic: 1.5x48 inch chamber, 1 inch modified sprinkler valve, 1.25x60 barrel.
These numbers just seem to be what people use who claim they achieved 300 yards.
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Unread postAuthor: LynyrdSkynyrd » Wed Jun 18, 2008 12:03 pm

well, combustion would make a nice bang, but probably would be more expensive than a simple pneumatic.

idk, i'm kinda partial to pneumatics. I've always liked them better.
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Unread postAuthor: jon_89 » Wed Jun 18, 2008 12:05 pm

I am leading towards the pnuematic just because I know it will work, but I like the combustion because of its portability. So do you think 300 yards is possible?
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Unread postAuthor: LynyrdSkynyrd » Wed Jun 18, 2008 12:10 pm

o yea. if the chamber:barrel ratio is right.

If you really want to get max distance you might want to make your own piston to get max flow.
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Unread postAuthor: starman » Wed Jun 18, 2008 12:19 pm

300 yards is further than most people think....

Depends on your ammo...going to be tough getting a potato slug out that far with anything... Golf ball or other hard ammo very doable. Hitting a potato with enough force to get it out 300 yards tends to vaporize it.

Chamber up to 4" on your combustion and put 3 centered spark gaps in there and you'll get golfballs out way further than that.

Of course, I'm a combustion guy.... :wink:
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Unread postAuthor: LynyrdSkynyrd » Wed Jun 18, 2008 12:25 pm

yea thats true.

could get into a huge debate on which is better, pneumatics or combustion.
if you're shooting a golf ball either one would be simple to get over 300 yards.

with a cannon that small. it really doesn't matter. Its once you get to a much larger scale the pneumatics starts overcoming combustions (unless of course you start using gunpowder.) :D
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Unread postAuthor: pat123 » Wed Jun 18, 2008 12:54 pm

according to hgdt a 1 once projectile will be just short of making it. 854 feet or 284 yards.
this is based on the combustion that you explained.
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Unread postAuthor: starman » Wed Jun 18, 2008 12:58 pm

LynyrdSkynyrd wrote:yea thats true.

could get into a huge debate on which is better, pneumatics or combustion.
if you're shooting a golf ball either one would be simple to get over 300 yards.

with a cannon that small. it really doesn't matter. Its once you get to a much larger scale the pneumatics starts overcoming combustions (unless of course you start using gunpowder.) :D


....Or hybridization and burst disks... :twisted:
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Unread postAuthor: Spuddin » Wed Jun 18, 2008 1:43 pm

ive seen a couple 300 yard shots on here, one was pitbull and his softball combustion (300 yds or real close). and i think the other one was sthorne. im sure there are lots more.
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Unread postAuthor: jimmy101 » Wed Jun 18, 2008 1:53 pm

Most claims of 300 yard ranges are bogus. It is possible with a golfball but probably not possible with most other common ammos (tennis balls, spuds etc.).

Can you even see a 1.5" shell at 300 yards? I have trouble seeing a 2" spud at 100 yards, at 300 yards the shell appears 9x smaller than at 100 yards.
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Unread postAuthor: MrCrowley » Wed Jun 18, 2008 2:11 pm

My SGV, which is a 1' 4" chamber with 1" sprinkler valve and a golfball barrel would probably only shoot about 250yards-270yards. You might need a bit more then that.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 18, 2008 2:14 pm

What pressure were you planning on using for a pneumatic? And a 2" sprinkler valve would be a better idea ;)

More importantly, what were you planning as a projectile?
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Unread postAuthor: LGM » Wed Jun 18, 2008 2:29 pm

Well, you could freeze the potato to harden it and then turn it on a lathe to 1.5", then you get some oxygen…

If you put a piston valve on a pneumatic of those dimensions you should be throwing stuff pretty far out there. Spray your projectile with glow in the dark paint and fire a little after sunset (or shoot a flashlight) to find it.
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Unread postAuthor: )DEMON( » Wed Jun 18, 2008 2:30 pm

The only thing I would really want to launch 300 yards is my sister.

Don't forget that you could use a burst disk on a pneumatic as well.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 18, 2008 2:46 pm

)DEMON( wrote:The only thing I would really want to launch 300 yards is my sister.


hahahaha excellent!

Is she not of the age where it's convenient to know her friends?
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