| kuduae |
| (.400 member) |
| 29/05/16 02:11 AM |
Re: Looking for a Mannlicher-Schönauer in 6.5x55, 7x57,
|
Quote:
However, max. CIP pressure for the 8x57 is 3900 bar/56,000 psi, and for the 8x56 MS it's 3200 bar/46,000 psi. Would there be an issue, or were the MS actions strong enough in the earlier models, and only modified in length with the 1924 - which was chambered in higher pressure rounds than the 1903/1905/1908?
Neither steel, dimensions, overall nor bolt length was ever altered. The 1924+ models merely had the magazine opening elongated to the rear and bolt travel lengthened.
The low CIP max pressures of the pre-WW1 Mannlicher-Schoenauer cartridges come from the 1930s German RWS and DWM factory loads, using the German R5 powder. The original pre-WW1 factory loads were loaded with the Austrian government monopoly powder 3 to the same ballistics like the later German loads. The Pulver 3 gave about the same ballistics like the German R5, but generated about 20% more pressure.So the original Austrian Roth and Hirtenberger loads worked at far excessive pressures by CIP standards. BTW, Karamojo Bell complained bitterly about excessive pressures when he tried a 6.5x54 M-Sch with Austrian cartridges. As he could not get DWM loads, he gave up using the carbine.