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everybody should IMHO, with modern powder and bullets, it is a 404 jeffery.

peter

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What velocity can one expect with 400grn bullets?

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everybody should IMHO, with modern powder and bullets, it is a 404 jeffery.

peter

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How can that be unless you are handicaping the 404 and promoting the 10.75x68. Capacity has a bearing and a smaller case can never equal a larger for performance unless there is a higher pressure in the smaller and that can not make it equal. What sort of pressures are you anticipating to get 2300fps-2350fps (RWS load) from the 10.75x68? In the same way a 30-06 can not be equal to a 300 Mag or a 7x57 to a 7mm Rem mag.

Von Gruff.

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gruff

im thinking in the lines of the original load of 400 grains at 2150 fps dublicating the 400 jeffery, the numbers you are quoting sounds to me like a 416 rigby load, so you are allready playing a pressure game beyond the original limits.

now hornady is allready bridging the distance between the 20-06 and the 300 mag, with the light magnum loadings.

what you are talking with your RWS load(brigde between 404 J and 416 rigby) is the same that im talking about with the 10,75x68 and the 404 j

peter

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Who use this cartridge for hunting ?

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Many still uses it, but in the old time it was used all over africa for everything. It wasnt up to the same potantial as the 404 but with modern loads it is as Peter states, possible to duplicate the "old" 404 load.

If you lived or was going to africa in the beginning of 1900, you took a long look at the london mausers, then a quick look at your wallet, and bought a german built mauser chambered for the 10,75x68.

--------------------
Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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What velocity can one expect with 400grn bullets?

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RWS say in his Reloading Manual about 600m/s ( 1950fps ) but you have to use very fast burning powder because the small capacity case! The ballistic is very poor! I never try to do that, the original bullet is the 347gr. thin jacketed FMJ bullet, very difficult to get today! And the next problem is the diameter of this one, between 10,70 and 10,73 ( and sometimes more ). The original 10,75x68 is different when you compare to the 404 Jeffery! Today a lot of "modern" 10,75x68 rifle's have a 404 ( .422 ) barrel!

For information:

404 Jeffery / 10,75x73 grooves 10,41 / 10,62
10,75x68 grooves 10,45 / 10,75

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Please, give me this modern load's to duplicate the 404 Jeffery! I want to push a bullet of 400gr. diameter .423/10,75mm FMJ ( the next problem! ) at 2400 fps! With a right 10,75x68 it's impossible to use 404 bullet's!

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Peter I was not talking about Rigby loading as much as looking at what factory cartridges were doing in my rifle. I had origional Kynoch and RWS cartridges( still have some of the Kynoch left but I except the RWS as a modern loading ) that I shot for comparative testing when i was developing loads and the Kynoch ran at 2192 and the RWS ran at 2315and even if we only look at the Kynch load it is still a bit above the 1950fps that Grandveneur quotes for the RWS load. I agree that modern powders and bullets give some of our older cartridges a performance increase but I would still hesitate to recomend the 10.75x68 to be used where one might have comfortably used a 404 Jeffery except in ideal circumstances and that is not always the case is it.
As regards the 30-06 with the light magnum loading and it bridging toward the 300 mag would it not hold true that the same technology and subsequent powder developement take the 300 Mag that much further ahead and maintain the performance disparity. This takes nothing away from the developement of better performance capability for the 10.75x68 and I would be interested, as I am sure will others,to see the data that you have for these new loads.

Von Gruff

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I have one and i shot 3 buffalo's with it! The story we know, in the French colonies we used it a long time, and today sometime again! To duplicate the 404 Jeffery, forget! Do you hunt with it?

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Please, give me this modern load's to duplicate the 404 Jeffery! I want to push a bullet of 400gr. diameter .423/10,75mm FMJ ( the next problem! ) at 2400 fps! With a right 10,75x68 it's impossible to use 404 bullet's!

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Please, give me this modern load's to duplicate the 404 Jeffery! I want to push a bullet of 400gr. diameter .423/10,75mm FMJ ( the next problem! ) at 2400 fps! With a right 10,75x68 it's impossible to use 404 bullet's!

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You dont know this cartridge

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peter

Edited by peter (13/04/09 05:03 AM)

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Peter

Lets not get too carried away with bullet diameters. There is plenty of information around about the different bore diameters of the old German and British DG rifles, with those for the .404J and 10.75x68 Mauser cartridges being no exception.

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There never was a 400gr factory load for the 10.75x68. All things being equal, it is ballistically impossible to match the .404J using a smaller case especially if maintaining reasonable DG working pressures and bullets seated to normal depth with a crimp applied. Experimental loads for the 10.75x68 duplicating the 404J and having out of spec pressures and cartridge lengths are only good for the target and probably not good for the gun.

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Why bother attempting to achieve that, just use the 10.75x68 as it is for fun and get a 404J for even greater fun, and for DG.

Eagle27

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You dont know this cartridge

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peter

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