7.65 Argentine vs. 7x57mm

[lgm270]

Interesting photo comparison  of the 7.65x53 mm  (7.65 Argentine) and the more widely used 7x57mm Mauser shell casings.

Most of the difference in the 53mm and 57mm cases is in the longer 7x57mm case neck.  The case capacity of these two rounds is virtually identical.  They have essentially the same case capacity.  The 7.65 shoots .311" bullets and the 7x57 shoots .284" bullets. 

There is a wild cat called the 30x57mm which is the 7x57 necked up to .308".   This round appears to have been designed for intermediate length mausers (i.e. Yugos) that are too short for the 30-06.  A 30x57mm gives you essentially 30-06 performance with the ability to use the fabulous varieity of .308" bullets in an intermediate length action.  Note that the 7.65x53mm is virtually identical to the 30x57mm wildcat in case capacity.  The factory 7.65 just has a shorter case neck.

How interesting that the  100 year old 7.65x53mm is essentially identical to the 30x57mm, except for .003" difference in bullet diameter.  How about a 7.65x53 reamed on a .308" bore so you could shoot .308" bulllets loaded into 7.65x53 cases.  The head stamps would match the barrel, notwithstanding the .003" difference in the bullet diameter.  The advantage to the .308" 7.65 is use of the greater variety of .308" bullets as compared with the comparatively limited .311" offerings from bullet makers.  Of course  factory 7.65's would  be .003" over size.  However, most who would do this are handloaders and 7.65 Argentine factory loadings are far and few between so this is not necessarily a potential problem.  Most 7.65 Argentine ammo is loaded light in deference to older, weaker mil surps in circulation. 

The interesting thing about this drawing is that it illustrates that the factory 7.65 and the wildcat 30x57mm  have essentially identical powder capacity and it sheds a new light on the idea of re-bareling a shot out 7x57 with a mil sup 7.65 Argentine barrel.   






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Interesting comparison of 30-06, 7.65x53mm and .308 Win.








http://ataleoftwothirties.com/wp-content/uploads/2011/06/Three-rounds.jpg

[mauser98us]

The 7.65 is quite  a round. I really think the .308 is based on it to some degree.

[Frank46]

I remember way way back when Norma used to load the 7.65 argy it would go over 2900 fps out of a 29" or so barrel. I think this was with a 150 grain bullet. Nowadays I believe their loading is somewhat slower. Frank

[rvtrav]

  The ready availability of some quality .311 diameter bullets really negates the reasoning for the 30x57. Unless you have a spare .308 diameter barrel and want for some reason to make a semi short cartridge wildcat.
 
 The 7x57 is one of my Favs, but I have a couple of 7.65 argees too, 1891, and 1898s. I like them all, really.
 
 one of the wildcat spinoffs from days ago (late '40s through the '50s and even the '60s)  was the 8mm/06, a rechamber of the surplus 98 mauser actions to take advantage of readily available 30/06 brass, because there was no 8x57 brass around, Today that is no longer the case either.
 
 Paul Mauser had some very good ideas and chamberings, we've come back to them time and again under many different names and for many different reasons, but the performance is the same.
 
  Rvtrav