8x57 JRS vs 8mm Mauser

Dimitri

Dimitri

Member
I recently purchased an AC44 G43 from an auction who said that it is chambered in 8x57 JRS. I’ve heard that 8x57 JS is the same as 8mm Mauser and both could be interchanged for one another. Is this the same case for 8x57 JRS?
 
Dimitri said:
I recently purchased an AC44 G43 from an auction who said that it is chambered in 8x57 JRS. I’ve heard that 8x57 JS is the same as 8mm Mauser and both could be interchanged for one another. Is this the same case for 8x57 JRS?
Click to expand...
JRS is rimmed. I am surprised that someone rechambered this to JRS. Is he for certain it really was???
 
Dimitri said:
I recently purchased an AC44 G43 from an auction who said that it is chambered in 8x57 JRS. I’ve heard that 8x57 JS is the same as 8mm Mauser and both could be interchanged for one another. Is this the same case for 8x57 JRS?
Click to expand...
! NO !
8x57 JS = ‘8mm Mauser’. YES. NOT= to 8mm MAGNUM !
I’ve seen the same error MANY times on popular auction sites, I believe it to be “cut & paste” disease, pandemic on internet sites for many different goods. The conversion isn’t being done for economic reasons, too much work & too risky on collectible firearms with zero advantages, but several disadvantages.
I would just about guarantee the OP that his rifle is chambered in “regular” 8x57 JS.

This is a pet peeve of mine if not obvious.
 
Okay thank goodness. I was thinking that a rimmed gewehr 43 would be stupid but wasn’t fully sure. Wouldn’t you also need to rework the magazines in order to avoid rim lock?
 
Dimitri said:
Okay thank goodness. I was thinking that a rimmed gewehr 43 would be stupid but wasn’t fully sure. Wouldn’t you also need to rework the magazines in order to avoid rim lock?
Click to expand...
possibly, but outside my experience. the only rimmed cartridge I shoot much is .22 rimfire, & sometimes .30-30 Win.
I imagine that in an extreme case of corrosion at the rear lip of a chamber, some clever person might be able to cut the groove for a rimmed cartridge in order to “save” a rifle. But the same talented machinist might bore & sleeve a pitted chamber, reaming to original caliber. beyond that possibility I don’t believe that the shape of 8x57 JRS is the same as the shape of 8x57 JS, rimmed cartridges are more tapered (generally speaking) between the rim/rimless end to the shoulder, all about extraction on earlier (pre-‘98) rifle/cartridge designs.

Once in hand, a close look with a bright flashlight will tell for sure.
 
You must log in or register to reply here.
Back
Top