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Old 07-27-2013, 01:47 PM   #51
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Quote:
Originally Posted by elfmdl

I was just looking into getting one of those, how's it workin for ya?
It's cool and can launch grenades (not live, of course), but I have no blanks to shoot it. Even if I did, I wouldn't launch this one. Maybe a golf ball launcher or some practice grenades. I got it for $15 at a collectors show. I think it's original, but maybe not. I know keepshooting.com sells em.
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Old 07-27-2013, 01:52 PM   #52
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Quote:
Originally Posted by texaswoodworker



I'd like to see what a round like that would actually do.

How's this one for crazy? 50 BMG necked down to .17.
I almost wanna think the bullet would disintegrate!
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Old 07-28-2013, 04:02 AM   #53
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Quote:
Originally Posted by Gizord1

I almost wanna think the bullet would disintegrate!
What if it was made of tungsten or something like that? Would there be any practical use (theoretically) of a 20 grain bullet going the speed of light
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Old 07-28-2013, 04:18 AM   #54
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Well, there HAVE been some ultra-speed loads from conventional firearms. There is a theoretical limit of about 5400 FPS. It maxes out based on the rate of expansion of the gasses that push the bullet. But bullets start flying apart from the spin. Note that the main gun for the Abrams and related tanks, which is VERY fast, is smoothbore- no spin.

We have gotten velocities on the close order of 10k FPS, but that was using explosives to drive the projectiles (the jet from a shaped charge can travel at about 16,000 MILES per hour!) Self forging projectiles, known as Miznay-Schardin effect. http://en.wikipedia.org/wiki/Explosively_formed_penetrator

There was some work being done with very light projectiles made of polycarbonate driven to some insane speeds with a magnetic driver (rail gun) but actual data on that is classified.

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Old 07-28-2013, 04:26 AM   #55
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Quote:
Originally Posted by c3shooter
Well, there HAVE been some ultra-speed loads from conventional firearms. There is a theoretical limit of about 5400 FPS. It maxes out based on the rate of expansion of the gasses that push the bullet. But bullets start flying apart from the spin. Note that the main gun for the Abrams and related tanks, which is VERY fast, is smoothbore- no spin.

We have gotten velocities on the close order of 10k FPS, but that was using explosives to drive the projectiles (the jet from a shaped charge can travel at about 16,000 MILES per hour!) Self forging projectiles, known as Miznay-Schardin effect. http://en.wikipedia.org/wiki/Explosively_formed_penetrator

There was some work being done with very light projectiles made of polycarbonate driven to some insane speeds with a magnetic driver (rail gun) but actual data on that is classified.
If I'm not mistaken, I believe Ackley did some high velocity tests with .50bmg necked to somethin. It sounds similar to the "ultra speed loads" you referenced.
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Old 07-28-2013, 05:29 AM   #56
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http://youtu.be/y54aLcC3G74


image-2804642640.jpg

There's no explosives in this pic, it's all plasma!

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In the late 2000s, the U.S. Navy tested a railgun that accelerates a 3.2 kg (7 pound) projectile to approximately 2.4 kilometres per second (5,400 mph).
If theses things weren't so F'ing big they would be awesome!
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Old 07-28-2013, 04:01 PM   #57
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Ummm- it helps if you have a nuclear reactor handy to POWER that thing!

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Old 07-28-2013, 05:18 PM   #58
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Quote:
Ummm- it helps if you have a nuclear reactor handy to POWER that thing!
Could you use those new-fangled lithium batteries?
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Old 07-28-2013, 05:29 PM   #59
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Quote:
Originally Posted by c3shooter
Ummm- it helps if you have a nuclear reactor handy to POWER that thing!
Nuclear powered carrier?
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Old 07-29-2013, 12:48 AM   #60
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Yep! That's it!

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