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Double Rifles, Single Shots & Combinations >> Single Shots & Combination Guns
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Tom_H
.333 member


Reged: 13/04/05
Posts: 335
Loc: Southeast, NY
9.3x72r twist rate
      #66001 - 17/11/06 01:06 PM

Just checked the twist on my 9.3 (that I am still trying to regulate) and it is a 1/16.
I ran it through the puter and that gives me a slug in the 270gr range.
Is this right or was the twist on my 1911 gun arbitrary?

Just took some Speer 270s and choped them down to 240 in the lathe to see if they push it over the amount that I still need.

Any 9.3 shooters willing to check the twist?

Thanks

Tom

--------------------
Carbonation without fermentation is tyranny

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CapeGunner
.224 member


Reged: 09/11/06
Posts: 19
Loc: New York-Hudson Valley-USA
Re: 9.3x72r twist rate [Re: Tom_H]
      #66050 - 18/11/06 05:21 AM

Last week was the first time I shot my Cape Gun. It is German made circa 1891-1911, probably earlier rather than later. Made by A Korinski, from Erlanden. I shot S&B 193 gr bullets. I measured the twist as 1 in 24".The results were good. I ran into a sighting problem with glare when the sun came out. I've since reblued the sights and will try again in the near future. I don't have the numbers with me but if memory serves me it has 4 grooves and 4 lands. I'm at work or I'd give the the measurments but I do remember they are not the same width.
Frank

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fuhrmann
.333 member


Reged: 04/01/05
Posts: 326
Loc: Switzerland
Re: 9.3x72r twist rate [Re: CapeGunner]
      #66730 - 10/12/06 06:05 PM

According to my 1940 RWS Handbook, the usual twist length for the 9.3x72R is 420 mm, translates into 1 turn in 16.5'' .
This refers to "normalised" cartridge dimensions.

fuhrmann

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