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Originally posted by Tonny

Hej Ignorant
Hvis i sænkede riflen under vand vil vandet vel finde ind i løbet og fylde det, der er vel luftrum nok omkring patronen til at luften kan presses forbi.Altså må løbet have været fyldt med vand under førsøget.
Fodbolden svarer nok til de ca. 3 liter som krudtgassen fylder efter affyring, det interesante er at den forøgede modstand som der jo nødvendigvis vil være, ikke giver så meget modstand at kuglen standses i løbet og derved gør riflen ubrugelig eller frembringer et ødelæggende højt tryk.Modstanden i mediet vand kontra luft er vel det som er essensen, jeg er klar over at kuglen standser meget hurtigere i vandet men er der så meget modstand at riflen ikke kan skyde uden at tage skade.
Ignorants modige forsøg viser jo at det er muligt.Altså må modstanden være overvindelig.

+GONE2HUNT+

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Der findes mange kyndige våbenbrugere, men han er bestemt ikke en af racen

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Jeg er bange for, at et billedbevis ville blive lidt for dyrt og farligt at fremskaffe, men endnu engang bed ham om selv at frembringe bevis for sin påstand og du vil sikkert se ham "back off", da han jo nok godt selv ved, at den er lidt tyndbenet.

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The surprising thing about the bulletproof water was how poorly the high-powered rifles did. The full metal jacket bullets for the high-powered rifles came apart upon hitting the water. Even the dreaded .50 caliber rifle was only able to penetrate about 3 ft of water.

Bulletproof Water
Myth: Water will protect you from being shot by bullets

They know that water will eventually stop a bullet, so they want to test to see how deep you have to dive to avoid being shot.

Gun selection
The various guns they tested during the myth were:

9mm pistol
M1 Garand
Replica Civil War black powder rifle
Shotgun
.50 cal rifle
Regarding the .50 cal ammunition:

Adam: "That's what this thing fires?"
Jamie: "It's smaller than my head, it's alright"

Water tank tests
They built a 'ballistic tank' out of 1" thick acrylic and iron girders. They stuck a block of ballistics gel into the tank that could be raised up and down to different depths.

9mm @ 6ft: the bullet went straight through the ballistic gel -- fatal
9mm @ 7ft: the bullet went straight through again -- fatal
9mm @ 8ft: the bullet only went 1/2" into the gel -- non-fatal
3" deer slug + Shotgun @ 6ft: As one might have expected, firing a shotgun into a narrow tank of water shattered the tank and sent everyone running to turn off all the lights to prevent short circuits. The slug shot went through the ballistics gel -- fatal
The shotgun test was the end of that particular test setup.

Pool tests
A vertical rig was a worst-case scenario. In order to make it easier to test and also to make it correspond better with a real-world scenario, they decided to make their new rig be at a 30 degree angle. At a 30 degree angle with an 8 ft penetrating bullet, you would only have to be 4ft underwater.

Someone strangely agreed to allowing Adam and Jamie to shoot off guns in their pool. Adam made a new 20 ft railway for the ballistics gel target and they mounted it at a 23 degree angle.

For the first test they used a replica Civil War black powder rifle shooting Jamie's homemade bullets at 1000 ft/s.

Replica Civil War rifle @ 15 ft: The bullet veered way off target.
Replica Civil War rifle@ 5 ft: they couldn't find the bullet and the ballistics gel was still intact -- nonfatal
Replica Civil War rifle @ 3 ft: The bullet went through the gel -- fatal. At this distance, though, the gel was only 2 ft underwater because of the angle.
They switched to a .223 rifle, which shoots at 2500 ft/s

.223 rifle @ 10 ft: the full metal jacket bullet shattered into tiny bits upon hitting the water -- nonfatal
223 rifle@ 3 ft: once again the bullet broke up. The tip of the bullet was resting on the ballistics gel -- nonfatal (myth confirmed)
The next gun up was the M1, which shoots at 2800 ft/s. In their Bulletproof Glass mythbusting, the M1 was capable of penetrating 2.5" of bulletproof glass.

M1@ 10 ft: tiny bullet fragments once again
M1@ 2 ft: the bullet only pierced the gel 4", which would be enough to just pierce the skin.
They finally broke out the big gun, the .50 cal with armor-piercing rounds, which are shot at 3000 ft/s.

Adam: "Hopefully we'll be gone before the pool fully drains"

.50 cal @ 10 ft: even though the water exploded, the ballistics gel was intact. Water made it all the way up to the ceiling. As it was with the previous guns, the bullet round came apart on impact. It lost all of it's energy within the first 3 ft. You would be safe 14" underwater at a 23 angle from a .50 cal.
confirmed: you can protect yourself from a bullet by diving underwater. If the shooter were directly overhead, you would probably be safe from most guns at 8 ft. At a 30 degree angle, you would only have to be 3 ft underwater to be safe.

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Bullets Fired Into Water
Original Bulletproof Water episode

This time around, they want to test if it was possible to fire ordinary guns underwater. There were to questions in particular they wanted to answer:

Will an regular gun fire underwater?
At what distance is would a bullet (from a regular gun) fired underwater be lethal?
Test setup:

Water trough that the bullets were fired through
Movable ballistics gel target to test lethality
Test weapons:

Colt King Cobra, .357 magnum full metal jacket
Sig Sauer P239, 9mm
M1 Garand
12-gauge shotgun
There are Special Forces guns that can fire underwater (Glock 17, Russian SPP-1 underwater pistol), but they wanted to test whether 'regular' weapons could do the trick.

Tory made sure that there was no air in the barrel because, if there was, the barrel could explode.

The first up was the 9mm. Without a ballistics gel target, the bullet went 18 ft. This answered the first question: yes, you can fire a regular gun underwater (confirmed). The 9mm bullet was intact, but the casing wasn't ejected from the gun. Instead, it was stuck in the slide, so you would only get one shot underwater.

Now they had verified that you can fire a gun underwater, they moved onto testing lethality. In the original episode, they found that a 9mm gun fired into water was lethal at 8ft. No so for a bullet fired underwater: the 9mm bullet didn't even come close to penetrating the target at 10ft. They next moved the target to 2ft, at which point they couldn't find the bullet. Same with the .357 magnum: they lost the bullet when fired at 2ft from the target.

Back at the shop they dissected the ballistics gel block and found the 9mm at 4" deep and the .357 magnum at 5.5", i.e. both would be lethal at 2ft.

The other guns didn't fare as well. The 12-gauge shotgun cracked on firing with heavy damage to the barrel and stock. The impressive M1 Garand also fared poorly. The M1 has an exit velocity of 2700 ft/s, 3 times the energy of the other guns they were testing, but in the original Bulletproof Water episode, they had already seen it fail to shoot into water -- bullet shattered on impact. The firing underwater was equally unimpressive: the bullet was intact, but it only went 6 ft, less distance that the 9mm.

Science Content: To be fired underwater, a gun's barrel must first be air-free, or the resulting spike in pressure that occurs when a round is fired could cause the gun to explode.
Test # 1: 9mm semi-automatic pistol fired at ten feet.
Result: The gun fires, but it doesn't penetrate the block of gel, meaning that at this distance the weapon is non-lethal.
Test # 2: 9mm semi-automatic pistol fired at two feet.
Result: The weapon fires again, but the bullet is not found, and mysteriously there are no holes in the ballistics gel, leading Tory to joke about a "magic bullet".
Test #3: .357 magnum revolver fired at two feet.
Result: The result from the test with the revolver are the same as with the semi-automatic pistol; the weapon fires but no bullet is found inside the trough, and neither are any bullet holes found in the ballistics gelatin.
Test # 4: Twelve-gauge shotgun fired at a distance of ten feet.
Result: The weapon fires, sort of. The shotgun actually explodes, cracking the barrel and stock of the weapon, meaning that none of the shot would actually enter the victim.
Test # 5: The M-1 Garand military rifle fired at a distance of ten feet.
Result: The projectile exits the barrel of the high-powered weapon, but drops after traveling only six feet, meaning that despite its high level of firepower in normal conditions, this weapon is actually non-lethal when used underwater.
Having finished all the tests, the build team packs up and goes back to the shop to analyze the ballistics gelatin blocks. They make one inch slices of the blocks, and the two missing rounds are found buried inside the gel at distances that would be lethal if they were to enter a human being.
This myth is CONFIRMED. You can fire a weapon underwater, but it is not desirable, because your victim is much more likely to survive than if you were to target him while you were both on land.

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Tory made sure that there was no air in the barrel because, if there was, the barrel could explode.

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