7x57JR

[yellowknifedave]

Howdy.

I have the opportunity to buy a drilling in 7x57jr.  I am a fan of 7x57r, so am sorely tempted.  I can't find any information on 7x57jr; could someone shed some light on this caliber, and maybe a source for brass?

Thanks.

Dave

[Sir Charles deMoutonBlack]

That's a new one on me!

I've heard of 8 x 57 J,  8 X57 JR, 8 x 57 JS , and 8 X 57 JRS, but seven millimetres usually don't require the extra alpha-getti's.

Have you seen the drilling, is are you going on someones description?

[yellowknifedave]

The seller indicated stamps on the barrel indicated that designation.  It is a sauer and sons 16/16/7x57JR.  I have asked that he send pics of the proofs so I can find out more. 

Dave

[Rangr44]

The "J" & "S" are usually associated with  8x57 Mauser rifles/ammo - as in 8x57J / 8x57JR or 8x57JS / 8x57JSR.

That was because the 8x57 was initially made with a slightly smaller bore than the later rifles with larger bores - which also used the then-new spitzer ("S") bullets.

AFAIK, there has never been such an issue with a 7mm bore - long standardized @ .284" in both the 7x57 & 7x57R.

It could be that a barrel marked "J" has a short-throated chamber, not meant for relatively modern spitzer bullets.
If that's the case,  "normal" 7x57R ammo might be able to be used if the throat is lengthened.

.

[yellowknifedave]

Missed it by that much.  Should have just bought it and then figured it out.

Maybe next time.  Thanks for all of the input.

ykd

[yellowknifedave]

Turns out the seller got it wrong.  It was 8x57jr.  Was bought by a fellow I know.............