I just acquired a drilling in 8x57JRS. The bore is .323.

Will dies and sizer in 8x57 Mauser (.323) work for me? Also, I think the correct shell holder is RCBS #4? I'd like to stay with RCBS if possible, but I think there may be other options for the size and seating dies.

Many thanks!

Yes, same same,just a rim.

I use RCBS 8mm Mauser dies but use a Hornady shell holder, I don’t think the RCBS #4 is correct, but I could be wrong.

If the R in JRS represents Rim, the #3 and #4 RCBS shell holders are wrong. The #4 fits the belted case.

In my loading for the rimmed 8x57R, I have used RCBS shellholder number 26 and also Lee shellholder number 14 with perfect success.

The 8x57R rifles I have loaded for all were of the smaller .318" groove diameter (8x57JR) rather than the .323" groove 8x57JRS, but I found that common RCBS "8x57 Mauser" dies worked fine with just a change in expander ball diameter. Since your rifle has the .323" "S" groove diameter, RCBS "8x57 Mauser" dies will work great just as they are.

RCBS #3 is the correct shell holder, works on my 8x57 .323 and my 7x57, and my 8mm-06, and 8mm-06 IMP, and any caliber based on the 30-06 case.

#4 is for the belted cases...

The original poster Dahav said above that he has the rimmed version (8x57 JRS) in a Drilling, not the standard rimless 8x57 in the usual bolt rifle. RCBS number 3 shellholder fits the rimless 8x57, the .30-'06, .243, etc, etc; but not the rimmed version.

bpesteve:

Exactly. People here can't read or what.

For 8x57 JRS (IRS) it is #26. Same as for 7x65 R

https://www.rcbs.com/dies-and-...lder-26/16-9226.html

Jiri

Rim dimensions are exactly the same:

Thanks to you all.

From this thread I gather that the RCBS dies for the 8x57 rimless (.323) will work for me and the correct shell holder is RCBS #26?

Also, for the 8x57 JRS which bullet do you recommend? It seems the two most popular are bullets in the 170 to 200 grain range.

Using starting loads can I use load data for the 8x57 (.323) rimless for the 8x57 JRS?

After searching the www I found that Hornady makes dies specifically for the 8x57 JRS. Do any of you have experience with Hornady dies?

Thanks again for your help-

quote:

RCBS #3 is the correct shell holder, works on my 8x57 .323 and my 7x57, and my 8mm-06, and 8mm-06 IMP, and any caliber based on the 30-06 case.

A few years ago a collector wanted to have the head space checked on all of his Mausers collection. He was told it was not possible by local smiths so I contacted him and offered to send him a set of gages that measured the length of the chamber in thousandths from go-gage length to + .021". He did not know me so I understood why he was afraid; eventually he got the gages and no one understood how they worked. He decided to promote three rifles to wall hangers because the chamber lengths exceeded .017"(.017" longer than a go-gage from the datum to the bolt face).

I suggested he try reloading; I told him I had one rifle with a chamber that was .002" longer than a field reject length chamber. I told him I fired that rifle with .002" clearance (between the case head and bolt face).

F. Guffey

quote:

Originally posted by Dahav:
Thanks to you all.

From this thread I gather that the RCBS dies for the 8x57 rimless (.323) will work for me and the correct shell holder is RCBS #26?

Also, for the 8x57 JRS which bullet do you recommend? It seems the two most popular are bullets in the 170 to 200 grain range.

Using starting loads can I use load data for the 8x57 (.323) rimless for the 8x57 JRS?

After searching the www I found that Hornady makes dies specifically for the 8x57 JRS. Do any of you have experience with Hornady dies?

Thanks again for your help-

Yes, a comprehensive RCBS shell holder chart I have from an early Handloaders Digest lists #26 as correct for the 8x57 Rimmed (JRS) cartridge.

FYI this shell holder is also listed as correct for the 7x61S&H and in addition fits the 404 Jeffery and the Winchester Short Magnum (WSM) cases too. I use the #26 shell holder for these three cartridges so can vouch for it as a perfect fit.

Hornady dies are fine. I have used the 170gr and 150gr in the 8x57, either work.

quote:

Originally posted by Dahav:
Thanks to you all.

From this thread I gather that the RCBS dies for the 8x57 rimless (.323) will work for me and the correct shell holder is RCBS #26?

Also, for the 8x57 JRS which bullet do you recommend? It seems the two most popular are bullets in the 170 to 200 grain range.

Using starting loads can I use load data for the 8x57 (.323) rimless for the 8x57 JRS?

After searching the www I found that Hornady makes dies specifically for the 8x57 JRS. Do any of you have experience with Hornady dies?

Thanks again for your help-

There are so many factors to take into consideration in loading for the many versions of the "8x57 Mauser" that I wouldn't even begin to offer loading info here. The German reloading manual "Wiederladen" has four separate sections for these, including separate maximum pressures for each: 8x57I (3800 bar), 8x57IR (3200 bar), 8x57IS (3900 bar), and 8x57IRS (3300 bar).

Also, without looking at the Drilling involved, there's no way to tell what condition it may be in or even whether it is clearly marked as to being an 8x57IR or an 8x57IRS. Dahav has stated that "The bore is .323.", but without other confirmation it's really not possible to say what that Drilling might have been proofed for.

I will say that in loading for my 8x57 rimmed break open guns I have typically loaded 196-200 grain bullets to no more than 2300 fps (700 m/s) and I've been perfectly happy with 2200 fps.