What caliber round is this?

[Torian]

Got this in the mail today....

Here's a clue: the round on the left is equivalent to WW1 era tank rounds, with enough recoil force to dislocate your shoulder, or break it, if not properly dissapated. Round on the right is a 5.56 for reference.

 

[rcmodel]

Mmmm?

Is this a Firearms Research question because you don't know what it is you got in the mail??

Or a guessing game of some kind posted in the wrong forum??

rc

 

[Torian]

I believe this round would qualify as an obscure / unique and now historic cartridge since it is no longer being produced by the original manufacturer.

I know what it is, but thought a little trivia would be fun. If it doesn't fit in this forum, mods are welcome to move it to the appropriate venue.

Quite the party pooper rcmodel

 

[Kernel]

French 37mm x 94mm R, or a derivative.

 

[rcmodel]

With the wrong projectile in it.

rc

 

[303tom]

That is a .950 JDJ !..................

 

[OptimusPrime]

Is it a .22LR?
I haven't seen one for years...............

 

[Torian]

Nice job 303tom....it is in fact the .950 JDJ. Here's a little background on the cartridge:

Cartridge[edit]

Loaded .950 JDJ cartridges are approximately the length of an empty .50 BMG casing (i.e., 4 in or 10 cm), and are based on a 20×102mm case shortened and necked up to accept the .950 in (24.1 mm) bullet.[1] Projectiles are custom-made and most commonly weigh 3,600 grains (230 g) which is 8.2 ounces or over half a pound.

As its name implies, rifles chambered for the cartridge have a bore diameter of 0.950 in (24.1 mm), which would normally classify them as Destructive Devices in the United States under the 1968 (1934) National Firearms Act. However, SSK sought and received a "Sporting Use Exception" to de-regulate the rifles, meaning they can be purchased like any other Title I rifle by a person over age 18 with no felonies on their criminal record.[citation needed] The rifles themselves, of which only a handful have been made, use McMillan stocks and extraordinarily thick Krieger barrels bearing an 18 lb (8.2 kg) muzzle brake. Overall, depending on options, the rifles weigh from 85 to 110 pounds (39 to 50 kg) and are therefore only useful for shooting from a bench rest or heavy bipod.[3] Despite the weight, recoil is significant, and shooters must be sure to choose components (i.e., scopes and bipods) that can handle the abuse. The sheer size and weight of these weapons makes them impractical for hunting use, as they cannot be carried afield. Thus, they are largely "range queens"—rifles that are brought to the range for a fun time, but not usually used for hunting or other "more practical" uses. Additionally, the cost of owning and operating such a firearm is beyond most shooters; the rifles cost ~US$8,000, loaded cartridges are $40 each, and the individual lathe-turned bronze bullets are $10 apiece.[4]
Ballistics

The cartridge propels its 3,600 gr (230 g) bullet at approximately 2,200 ft/s (670 m/s). This yields a muzzle energy of 38,685 ft·lbf (52,450 J)[1] and a momentum of 154.1 Newton-seconds, about the same as a 20×102mm Vulcan round.[citation needed] This kinetic energy would allow the .950 JDJ to pass through several body-armored humans. It is comparable to the original tank rounds of World War I in terms of ballistics.[citation needed]
By comparison, the 5.56×45mm NATO cartridge, used in the M16 rifle, produces between 1,200–1,300 ft·lbf (1,600–1,800 J), while the .308 Winchester, a favorite for hunters and medium-range police/military sniping, produces between 2,000–3,000 ft·lbf (2,700–4,100 J) depending on the load used. The ballistics of the .950 JDJ are more similar to that of the 20mm autocannon round, which delivers approximately 39,500 ft·lbf (53,600 J). The muzzle energy of the .950 JDJ is comparable to the kinetic energy of a 2,800 lb (1,300 kg) automobile traveling at 20 mph (32 km/h).
In a 110 lb (50 kg) rifle, this will develop well over 200 ft·lbf (270 J) of free recoil energy if an efficient muzzle brake is not used. This is far beyond the shoulder-firing capacity of nearly all humans, even without considering the difficulty of shouldering such a heavy rifle. Shooting is usually heavy "lead sled" or similar shooting rest, and the rifle is not held to the shoulder because of the severe recoil and possible injury. The rifle scope has significant eye relief to avoid injuring the ocular orbit.

Video showing the experience shooting the .950 JDJ

http://www.youtube.com/watch?v=xohy9gWz7kk

 

[Jim K]

I want one to keep under my pillow for home defense.

Jim

 

[Willie Sutton]

Thought it was a 37mm, for the M1916. Quite an impressive piece of equipment to say the least.

Now reading about the JD... ouch!


Willie

.

 

[swampcrawler]

i actually knew that one. just got beat to it lol.

good squirrel round?

 

[Speedo66]

Anybody making a pistol for it yet?

 

[Arkansas Paul]

Looks like the ammo that I carry in my CC piece. It is an inside the waistband carry.

 

[Val USP]

I want one to keep under my pillow for home defense.

Jim

hehe
what size of that pillow you needed

 

[angrymike]

Jim
That would leave quite a hole in the perp, that's for sure......;- D

 

[98Redline]

...and a hole in the wall, and the next wall, and the brick wall out front, and the neighbors car, and the oak tree beside their driveway, and....

 

[Midwest]

good squirrel round?

That squirrel would be vaporized

 

[blarby]

Curious about the JDJ brass- do they lathe turn it ?

That looks like it'd be a might unsettling to draw.

I noticed they say its made from a 20*102- I guess that'd be the source question, lulz.