doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com 7x57 R is it the same?

As 7x57 Mauser?
Thanks.

I am all confused about these rifle cartriges. Same caliber can have 5-10 different names attached...Must be all different, otherwise why name them differently?

Sliver,
7x57R in rimmed version of rimless 7x57 Mauser. The rimmed version is used mostly in European combination guns.
Regards,
Jani

Silver:

There are at least 3 different variations where the rim diameter is different. Mauser began with a cartridge in the early 1890s with a larger cartridge in the M93 series, than it's parent 8mm version, the M88. Then there's the Chinese variant called something like 7.4X57. Then either it was standarized in the 1930s or another variant referred to as 7X57R.

Kind Regards,

Raimey
rse

It's my understanding the "R" desiginates "rimmed", which means the cartridge case has a rim of a diameter larger than the case body which protrudes from the case like the rim on a shotshell. This allows for extraction in a double barreled rifle. The 7X57 case has a rim the same size as the case body with a rebated (smaller diameter) groove between the rim and the body, into which the claw (or other) type, of a rifle with a bolt engages for extraction. Example: the 45-70 is a rimmed cartridge, the 30-06 is not. Hope this helps. Bill

Silver,
7x57 Mauser is the Military round and is non-rimmed. The 7x57 R is a rimmed sporting cartridge of same dimensions except it has a rim for extraction in arms like double rifles.
Bob Jurewicz

To state it another way, I use 7X57 dies to load 7X57R.

Normally, the 7X57R is loaded to somewhat less chamber pressures than 7X57. Still, given the generally longer barrels of 7X57Rs, with slow powders and 175 grain bullets, I can easily get nominal 7X57 velocities and have no pressure-related issues. All failures I have had with Norma 7X57R cases have been neck splits, commonly after about 10 firings. I follow my normal practice of resizing cases only enough for them to chamber easily, basically, resulting in cases seating on the shoulder.

Niklas

For a "real" single shot, you can use regular 7x57 ammo in a 7x57R gun...ejection via a cleaning rod. Very slow.

sv

With no threat of a head spacing problem?

Nope, same dimensions all the way around. It just has a rim that sticks out instead of being even with the case wall. You can even load regular 7x57 cases with a 7x57R die.

sv

That doesn't make much sense. The rimless case headpaces off the shoulder, at the "datum line", the rimmed version off the rim. The lengths of the two cartridges from the rim to the shoulder "datum line" would have to be exactly the same, or there indeed would be problems with excess hedspace. A full length sizing die can quite easily cause problems in this regard. It could, of course, be made to work, but I would think just substituting rounds "right out of the box" your chances might not be too good. You might well say you have done it and it worked, but that would be a fluke I think.