Review by sam
Posted On: 10/24/11 By: Douglas
Posted On: 10/21/11 By: Dustin Stradal
Posted On: 10/21/11 By: jrff radtke
Posted On: 10/21/11 By: Christopher
Posted On: 10/11/11 By: Rich
Posted On: 9/27/11 By: Ross
This can definitely be confusing, and the reason is that many minor changes were made to the 8x57 cartridge over the years as it was adopted by various militaries and used in civilian hunting rifles as well. The simple answer to your question is that the "I" on some German rifles (which stood for "Infantry") was misinterpreted as a "J," and the mistake stuck so well that it eventually became the commonly used name of the cartridge. In other words, 8x57 IS and 8x57 JS are the same cartridge - a .323" bore and a non-rimmed case.
However, there is more you should know about 8x57 ammo. You will also see 8x57 JRS, 8x57 JR, and 8x57 J. The "R" stands for "rimmed" and is intended for use in break action weapons - ammo without the "R" is designed for bolt actions. Without the "S" in the name, the projectile diameter is actually different as well - .318" for the "non-S" and .323" for the "S." Prior to 1905, German rifles were manufactured with the .318" bore diameter. If you have an 8x57 rifle, you should make sure that you know the chamber dimensions and bore diameter before buying ammunition for it. While shooting .318" projectiles in a .323" bore will only result in poor accuracy, doing the reverse is potentially hazardous.