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Compound Rounds from Sureshot

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Compound Rounds from Sureshot

Unread postAuthor: jagerbond » Wed Jun 17, 2009 8:13 am

[youtube]http://www.youtube.com/watch?v=6Ht8dMbPQ84[/youtube]

We've had this in the works for sometime, and finally we're able to get a good test session today. We recorded 500FPS at muzzle with our test BL-520. We started with 9 UHMW rounds and 12 lead caps and we're able to shoot the entire video session with 5 UHMW still re-usable.

They drill straight as a laser out 50 yards. 80 yards its dropping 3 feet and 100 yards dropping 9 feet.

Specs:
Total Weight = 135 grams
UHMW Length 3"
Total Length 3.25"
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Unread postAuthor: spudtyrrant » Wed Jun 17, 2009 8:24 am

:shock: those are ....... AMAZING i like those much better than the uhmw round(which was good in itself) i might just have to buy me some of those. Do you plan on making them in the same size as your original rounds?
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Unread postAuthor: jagerbond » Wed Jun 17, 2009 8:27 am

spudtyrrant wrote::shock: those are ....... AMAZING i like those much better than the uhmw round(which was good in itself) i might just have to buy me some of those. Do you plan on making them in the same size as your original rounds?


Yes, and 2.5" too.
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Unread postAuthor: Gaderelguitarist » Wed Jun 17, 2009 11:23 am

Are you planning on making a round with a harder, sharper nose for piercing purposes? I think that would be the next step.

These are great though! I actually made myself a couple of the plain UMMW on my lathe and they pack one hell fo a punch.

Has the lead insert ever flattened upon impact?
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Unread postAuthor: pizlo » Wed Jun 17, 2009 11:31 am

I wish the video had shown the effects of a hard impact, because I've seen lesser guns pancake led.
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Unread postAuthor: Technician1002 » Wed Jun 17, 2009 11:58 am

pizlo wrote:I wish the video had shown the effects of a hard impact, because I've seen lesser guns pancake led.


Would be nice, but the video was for the flight accuracy. For that it is fantastic. :shock: Nice job guys.
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Unread postAuthor: jagerbond » Wed Jun 17, 2009 5:16 pm

Gaderelguitarist wrote:Are you planning on making a round with a harder, sharper nose for piercing purposes? I think that would be the next step.

These are great though! I actually made myself a couple of the plain UMMW on my lathe and they pack one hell fo a punch.

Has the lead insert ever flattened upon impact?


Here's some photos of the recovered lead. Notice the variance depending on distance and object struck. The left one is un-fired for reference. The real flattened ones were from hitting the carpet right where its draped over the boom to get the initial sighting dialed in. There is some carpet embedded in the lead. The carpet did a great job slowing the rounds down and allowing them to be re-usable.

We will get some damage video up soon.
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Unread postAuthor: pizlo » Wed Jun 17, 2009 5:56 pm

Right so the plastic is good for many uses, bu for most targets (the average ones for spudders at least)the led is a one use.
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Unread postAuthor: Gaderelguitarist » Wed Jun 17, 2009 9:12 pm

I never would have thought to use carpet for a target. That's pretty smart.
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Unread postAuthor: skyjive » Wed Jun 17, 2009 9:51 pm

Wow good job with these! It looked in the 100 yard shot as if they were tumbling significantly, which I thought was a bit odd with all that mass in the nose. Any thoughts on that?
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Unread postAuthor: Hotwired » Wed Jun 17, 2009 10:38 pm

I use carpet as a ricochet catcher ^^

I'm also seeing wobble in the 100 yard shots, suspect it's the tail wagging behind the lead nose.
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Unread postAuthor: Gaderelguitarist » Wed Jun 17, 2009 11:40 pm

Haha alright Hotwired, you're smart too!

Anyways, I also noticed that the rounds do wobble a bit.
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Unread postAuthor: jagerbond » Thu Jun 18, 2009 12:11 am

skyjive wrote:Wow good job with these! It looked in the 100 yard shot as if they were tumbling significantly, which I thought was a bit odd with all that mass in the nose. Any thoughts on that?


Not tumbling actually, the rounds are experiencing yaw or pitch depending on the direction. At 100 yards much of the KE is lost to air friction and the problem is exaggerated. The hundred yard mark, for this velocity, is probably outside the nominal range, the video was just to show that we can hit a 2' circle out that far consistently. Nominal range, for this velocity, is inside of 60 yards where round is flying straight and still retains much of its energy.

The mass is far on the nose, the CG of these is far enough forward that they won't even lay on there side, they just stand up lead side down. I'll post the video of the "weeble wobble" compound rounds later.
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Last edited by jagerbond on Thu Jun 18, 2009 12:40 am, edited 1 time in total.
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Unread postAuthor: Technician1002 » Thu Jun 18, 2009 12:11 am

Gaderelguitarist wrote:I never would have thought to use carpet for a target. That's pretty smart.


:D Done that.
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Unread postAuthor: jackssmirkingrevenge » Thu Jun 18, 2009 12:57 am

I still think an ordinary bolt would have sufficed as an insert and been a bit more durable, but in any case as per e-mail this is a fantastic result and it's good to see it was worth all the effort you put into it :)
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