My blaser barrel is marked 8x57 IS

I am seeing 8x57 js ammo for sale

https://shop.nosler.com/nosler...-tip-ammo-20-ct.html

Does this work in my blaser?

Thanks

Mike

I is J in German.

quote:

Originally posted by Lamar:
I is J in German.

Thanks will pick up some nosler ammo.

Mike

I don't recall which is which on the designation but one was a .318 bullet, the other a .323 bullet. The .318 was very early. Most military versions were redone to the .323 bullets. Some of the civilian guns used the .318 a bit longer.
Your Blaser being a modern gun will more than likely have the .323 bore. You can always slug your barrel to be sure.
Leo

The 8x57 IS is the .323 groove diameter. I don't know of anyone using the .318 groove these days. The change was a very long time ago.

The old German letter "I" for infantry, looks like an English J, thus the confusion. S-bore rifles have a .323" groove diameter and use a .323" bullet diameter. The letter S was used because when they switched from the old 236-grain round nose to the Spitzer (meaning sharp pointed) bullet they also increased the groove and bullet diameters from .318" to .323". This happened around 1905 and was the reason the U.S. military switched from round nose 220-grain .30/03 ammo to the pointed 150-grain .30/06 ammo. They saw the trajectory advantage of the spitzer design. Sometimes you'll see ammo marked as "SS" meaning schweres spitzgeschoss meaning heavy, pointed bullet. The original (1905) spitzer was 154 grains (10 grams) and the SS bullet was 196 grains. SS bullets are also .323" diameter and were first used in WW1 for machine guns and then later used in the K98 in WW2.

JS is standard Mauser 8x57 .323 bore. The I is for Infantry and is a JS .323 bore..

JRS is the rimmed version of the 8x57...