8 x 57 JS Question

[Uncle Mike]

If it is a M48A then, originally it was 8X57JS. (.323")
But to be sure, get some 'cerrosafe' and do a chamber casting...it takes every bit of 10 min. to do!

 

[NCsmitty]

If it is a M48A then, originally it was 8X57JS. (.312")

.323 for 8x57JS.



NCsmitty

 

[Uncle Mike]

.323 for 8x57JS.

WOW...thank you! Head 'up and locked' this evening.lol hehehehe

I corrected that!

 

[BornAgainBullseye]

So wrong! the .308 will not will not even come out of the box and into the extractor in a rifle that is chambered for 8x57. The .308 case is way to FAT to even get the shoulder in the chamber. The 8x57 will make its way into the .308 chamber, but the fat .323 bullet will stop at the throat and the extra length of the 8x57 will not allow the bolt to close or even get close. If you can close the bolt on the 8x57, that is what it will be. Have it checked out before firing it. If the bolt closes on a NO-GO then have it set back and reamed.

 

[MMCSRET]

My VZ24s and my K98 will chamber a 308 Winchester cartridge, as long as it is in the extractor there is no reason it will not fire. Not a good policy, but not particularly dangerous either. Just a waste of 308 ammo, thats all!!!!!!!!

 

[jimmyraythomason]

"the .308 will not will not even come out of the box and into the extractor in a rifle that is chambered for 8x57." This isn't correct either. A .308 Winny works very well from an 8x57 Mauser magazine box WITHOUT any modification.

 

[Brimic]

Haven't tried to chamber a .308 in a 8x57 chamber, but the .308 has the same rim dimensions as the 8x57 (0.473" iirc) and wil fit the boltface percectly. The shoulder on the .308 is quite a bit wider than the 8x57 case at the same distance from the base. It might not chamber in a tight 8x57 chamber but probably would in a looser military chamber.

 

[jimmyraythomason]

Okay,I just tried a Federal .308 win.round in my 1937 Erma K98RC 8x57 Mauser(not a Yugo). It fed from the magazine perfectly BUT the bolt lacked closing by a full inch. No way in the world would this .308 round be able to fire in an 8x57 chambered rifle.

 

[Langlo]

Well - too bad that you got a rifle with a caliber you did not want - more expensive ammo for it too, but: if u handload or are willing to buy from rws or norma you have a very nice caliber for moose. This is the calibers the german army (Wehrmacht) used in their m98 mauser. After the World War II there were thousands of them in this caliber left in my country. Many of them are restocked and rebarrelled to 30-06, 6,5x55se or .308 and 9,3x62. Many are also used in more experimental wildcats. But there are still many of them in 8x57. - They are mainly used for moose hunting and are very effective. Norma loads them with a 196 grain traditional and also premium bullet (bonded) (oryx). If the rifle is performing in other respects, I would have kept it in 8x57. In Norway this caliber has a renaissance, and more and more rifles are bought in this caliber, also new ones. You can expect precision in this caliber, also good effect in the deer/moose/bear .

Hope this is useful

 

[Brimic]

I think Wolf makes 8x57 ammo at a reasonable price.

For reloading, I like bullets with a long bearing surface such as the Hornady 170gr RN or anything 198-200 gr. The groove measurements of the dozen or so 8mms I have range from .3235"- .326" with the Yugo being the tightest and the the 98/29 being the loosest.

 

[Langlo]

Interesting! Is the yugo some sort of Zastava, or is it some sort of surplus war material or .. ? You say it is the tightest, is it also the one wich produces the highest velocities ?

 

[slammy]

I'm really glad I ended up with the 8mm. It was a caliber that I did not have in my collection, although in the end I will probably sell it or trade it. Did the tire test this morning the rifle is definitely 8x57 and kicks like a mule or moose if you perfer....

 

[Brimic]

Interesting! Is the yugo some sort of Zastava, or is it some sort of surplus war material or .. ? You say it is the tightest, is it also the one wich produces the highest velocities ?

M48.

I've never run the full power loads over a chronograph. Accuracy-wise, it shoots well, but the 98/29 and 98/22s beart it out- possibly due to the longer sight radius on the Czechs.

 

[Mr_Pale_Horse]

Preduzece Crvena Zastava (Red Flag Enterprise) was so named on 13 January 1948 by the Yugoslavian Ministry of Defense. It produced the firearm in question.

In post Yugoslavian times, Zastava is still a heavily subsidized Serbian industrial conglomerate.