6.5x55 for 96 Mauser


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MtnCreek
May 10, 2012, 10:10 AM
Quick question: whatís the approx. CUP max for an original small ring mauser? Most of the data Iíve seen is ~45k max. I assume thatís data meant for small ring mausers. Please confirm.

Thanks!

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lonniemike
May 10, 2012, 06:16 PM
44-45-46KCUP are the usual numbers one finds. Plenty will tell you the 96 should not be loaded higher, but a number of European companies do(50KCUP) load a little higher. And CG and Norma reworked the basic CG 96 actions into a civilian model called the (G) 63. 63's are chambered in both 6.5X55 and 7.62NATO/308(52KCUP). Sometimes they are referred to as a g-6.Best

azar
May 10, 2012, 07:21 PM
I suppose that would depend on whose standard you're looking at? SAAMI or CIP?

SAAMI is 46K CUP (~51,000 PSI) while CIP is 380 MPa (~55,000 PSI). Nearly all reloading data available in the U.S. lists data maxed at 46K CUP. Although, in the past I've noticed Ramshot shows 55K PSI for some of their 6.5x55 loads. Vhitavouri, I believe, does as well (which is not surprising considering the slightly higher European standard).

SlamFire1
May 10, 2012, 08:49 PM
This is not a 6.5 answer, it is a 7mm answer. However all someone has to do is research the proof and standard operating pressures of the 6.5 X 55 cartridge around 1900, and I suspect, the answer will be the 45K max.


Rifle Magazine Issue 159 May 1995 Dear Editor pg 10

http://www.riflemagazine.com/magazine/PDF/ri159partial.pdf

Ludwig Olsen

Mauser 98 actions produced by Mauser and DWM were proofed with two loads that produced approximately 1000 atmosphere greater pressure than normal factory rounds. That procedure was in accordance with the 1891 German proof law. Proof pressure for the Mauser 98 in 7 X57 was 4,050 atmospheres (57, 591 psi). Pressure of the normal 7 X 57 factory load with 11.2 gram bullet was given in Mauserís 1908 patent boot as 3,050 atmosphere, or 43, 371 pounds.

While many Mausers in the 1908 Brazilian category will likely endure pressures considerably in excess of the 4,050 atmospheres proof loads, there might be some setback of the receiver locking shoulder with such high pressures.

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