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About 7.92 * 57 again!? |
ok. i see that the variation in numbers like 7.92 mm is due to the metric system itself . i want to know about the term I AND J AND IS OR JS?what is the reason for such a letters and what exactly these words means?while we know that the 7.92*57 i.j are the same in rounds and bore diameter,and the 7.92*57 IS and JS are the same in caliber(bore and bullet dia.) so why the word (i and j )and also(IS.JS) are used to name this caliber,why we dont take just one of these words?is there any differance between 7.92*57 i and 7.92*57j?in the early models?it really made me so mixed up!!!! there are many berno models in iran like 7.92*57 which nobody knows if it is i or js?and many guys confused to find out the right ammunition Battle field evolution in short. The 7.92x57mm utilizing a 318-inch diameter round nose 226gr bullet is the original cartridge designation, BUT they wonted to move up to a larger .323- inch diameter Spitzer design at 154gr bullet for better projectile efficiency. But instead of changing the name to a 8x57mm they in their infinite wisdom retained the old designation of 7.92x57mm and added a letters JS to show the change so now it鈥檚 7.92x57mm JS ant to show that the original is an original thy used the letter J so the 7.92x57mm is no longer the 7.92x57mm it is now 7.92x57mm J. Now I have over 40 years in this and I still get lost playing the metric evolution game. This is what happens when you have no set standards to keep every one in line. In America all weapons and ammo manufactures must abide in the SAAMI standards. http://www.saami.org/index.cfm Of which only American ammo is governed by, all other countries do as the damn well please. 1: The 7.92x57mm J denotes the original cartridge with a .318-inch diameter bullet and moderate pressure limits (Piezo CIP Pmax = 380.0 MPa). 2:The 7.92x57mm JS designates the later, higher pressure (Piezo CIP Pmax = 390.0 MPa) cartridge with a .323-inch bullet. Now known in Europe as the 7,92x57mm IS or the 8x57 IS, in the USA as the 8mm Mauser or 8x57mm JS, this cartridge was originally adopted by Germany in 1905 as the 7,92x57 IS. (IS stands for 'Infanterie, Spitz' or 'Infantry, Pointed'). The IS cartridge was a further development of the 1888 round - the 7.92x57 I - which used a round-nosed bullet, and was developed to be top-loaded into a rifle's magazine via disposable charger clip in the Gewehr 88 (or Commission 88) rifle. The 7.92x57 IS bullet was lighter, pointed, and 8.2mm (.323 inches) in diameter instead of 8.08mm (.318 inches) with an improved ballistic coefficient I would advise you take it to a gun smith and have him ID the proper ammo for your safety and others. He should not charge very much if any thing at all for this assistance. Then only use the ammo recommended for your weapon. D58 Source(s): Hunting with Rifle, Pistol, Muzzle loader and Bow for over 3 decades. Reloading Rifle, Pistol and shotgun for over 3 decades. The European commercial arms standards body CIP (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portative - Permanent International Commission) currently designates two 8mm cartridges of 57mm case length, following the original military practice. The 7.92x57mm J denotes the original cartridge with a .318-inch diameter bullet and moderate pressure limits (Piezo CIP Pmax = 380.0 MPa). The 7.92x57mm JS designates the later, higher pressure (Piezo CIP Pmax = 390.0 MPa) cartridge with a .323-inch bullet. The letter 'J' is actually not a 'J' at all, but an 'I' for 'infanterie'. However, at the time the German printers were using a typeface in which the letter 'I' looked like the modern 'J'. The letter 'S' stands for Spitzgescho脽 (pointed bullet), and the English word "spitzer" is derived from this German term. The American standardizing body for sporting cartridges SAAMI designates this latter cartridge as the 8mm Mauser, also known as 8x57mm JS. However, the SAAMI pressure limitation for this cartridge is taken from the older 7.92x57 I and is limited to (Piezo SAAMI Pmax = 241,317 MPa [35,000 psi]) or 37,500 CUP. This is done for safety, in case the .323-inch bullet is fired in an 'I' bore (.318 inch) rifle. European manufacturers generally only load to the lower pressure limit for 'I' bore cartridges; and the US based Manufacturer Hornady followed their lead in their (now discontinued) EuroSpec brand 8x57 JS load. To avoid potentially serious accidents, it is impossible to over-stress the vital need for distinguishing clearly between cartridges loaded for these two different bullet diameters, and only firing them in appropriately chambered/barrelled rifles. The original 1888 Mauser fired a 7.92x57 bullet that was .318 in diam at relatively low pressure. It was called the 8mm Mauser I for "infantry". Their "I" looked like a "J" so these days it's called a J. Later on in 1898, they wanted a bit more power and the rifle was worthy of it so they made the bullet .323 in diam and jacked up the pressure. That was the 8mm Mauser JS (infantry spitzer or pointed bullet). If you have an 1888 Mauser in 8mm, you should only fire the 8mm Mauser J....the lower pressure one. If you have a 98 or later in 8mm, you can fire all of the 8mm Mauser rounds. The American "8mm Mauser" is the Mauser JS, but it's loaded to the lower J pressures in case anyone accidentally loads one into an older 1888 rifle. You can buy full power 8mm Mauser JS ammo if you want. Wow! Maybe I should start copying and pasting junk off the web, too. That other guy is at level 6! And to think, all this time, I've been thinking and typing my answers! Jeeez! The original .318 caliber round was the 7,92x57 Infanterie, but the florid lettering looked to English and American ammunition folks like a J, and it's been J ever since. OOPS! When the new lighter weight spitzer bullet of .323 caliber was introduced in 1905 (causing other countries to rethink their cartridges, for instance the US 30-03), they didn't change the numerics, even though there was a slight change in the caliber. They just called it Infanterie Spitzer Geschoss, or IS, which naturally got turned into JS when it travelled overseas. |
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