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Shooting & Reloading - Mausers, Big Bores and others >> Mannlicher Discussion forum & Archive

kuduae
.400 member

Reged: 13/01/10
Posts: 1792
Loc: middle of Germany

Re: What bullets for the 9x56ms?
12/06/22 06:19 AM

For some time now I am working on loads for a Mannlicher – Schoenauer M 1905 in 9x56 M-S

I never encountered the same problems with any 9x57 Mauser, rimless or rimmed, rifle barrel. As my barrel is of .357” groove diameter, shooting .358” bullets from reformed 8x57 brass should not be a problem but it was. A chamber cast revealed the culprit: As Daryl_S noted above, P.O.Ackley once experimented with oversized bullets in grossly undersized barrels. His findings: It’s not the undersized barrel that raises pressure, but the too tight chamber neck and throat dimensions that allow no case neck expansion to release the bullet. Well, the Austrians had found out the same thing 40 years earlier, in 1916, when they adapted tens of thousands of conquered Russian Moisin – Nagant rifles to use their own 8x50R Mannlicher cartridges by simply rechambering with a generous neck and forcing cone and shot their .324” bullets through the.313” groove barrels. But in 1905 the Steyr people apparently did not know this. The chamber cast revealed an undersize neck area with barely 9.68 mm, even a tad below the now CIP minimum of 9.7 mm = .382”. Maybe a worn chambering reamer? Comparing the CIP numbers for the 9x56 M-S and the 9x57 Mauser revealed the general problem. As both cartridges use the same 9.08 mm = .357” bullets, the chamber and case neck diameters differ considerably: Max cartridge neck diameter of the M-S is 9.65 mm = .380” vs. 9.83 mm =.387” of the Mauser. Minimum Chamber neck is 9.7 mm = .382” vs. 9.88 mm = .389”. So the 9x56 M-S chamber has much less leeway regarding variations in bullet or case neck thickness. My solution: I will open up the neck area of my chamber with a 9.9 mm = .390” reamer.

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Subject	Posted by	Posted on
What bullets for the 9x56ms?	casper50	28/05/22 05:05 AM
Re: What bullets for the 9x56ms?	3DogMike	28/05/22 06:07 AM
Re: What bullets for the 9x56ms?	casper50	28/05/22 06:18 AM
Re: What bullets for the 9x56ms?	3DogMike	28/05/22 06:24 AM
Re: What bullets for the 9x56ms?	fjrdoc	28/05/22 07:33 AM
Re: What bullets for the 9x56ms?	93x64mm	28/05/22 07:50 AM
Re: What bullets for the 9x56ms?	fjrdoc	28/05/22 08:09 AM
Re: What bullets for the 9x56ms?	DarylS	28/05/22 11:25 AM
Re: What bullets for the 9x56ms?	szihn	30/05/22 04:33 AM
Re: What bullets for the 9x56ms?	casper50	30/05/22 04:25 PM
Re: What bullets for the 9x56ms?	fjrdoc	10/06/22 09:12 AM
Re: What bullets for the 9x56ms?	casper50	10/06/22 11:09 AM
Re: What bullets for the 9x56ms?	DarylS	10/06/22 12:26 PM
Re: What bullets for the 9x56ms?	casper50	10/06/22 01:10 PM
Re: What bullets for the 9x56ms?	fjrdoc	11/06/22 04:02 AM
Re: What bullets for the 9x56ms?	casper50	11/06/22 04:17 AM
Re: What bullets for the 9x56ms?	DarylS	11/06/22 05:06 AM
Re: What bullets for the 9x56ms?	casper50	11/06/22 05:19 AM
Re: What bullets for the 9x56ms?	DarylS	11/06/22 05:23 AM
Re: What bullets for the 9x56ms?	3DogMike	11/06/22 08:20 AM
Re: What bullets for the 9x56ms?	casper50	11/06/22 09:13 AM
Re: What bullets for the 9x56ms?	3DogMike	11/06/22 09:31 AM
Re: What bullets for the 9x56ms?	DarylS	11/06/22 10:38 AM
Re: What bullets for the 9x56ms?	kuduae	12/06/22 06:19 AM
Re: What bullets for the 9x56ms?	DarylS	12/06/22 08:24 AM
Re: What bullets for the 9x56ms?	casper50	28/05/22 07:46 AM
Re: What bullets for the 9x56ms?	DarylS	28/05/22 05:24 AM

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