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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

kuduae
.400 member

Reged: 13/01/10
Posts: 1775
Loc: middle of Germany

Re: 500 Jeffery
08/06/21 01:40 AM

As everyone knows, the .500 Jeffery started out as the 12,7x70 Schüler. All known prewar “.500 Jeffery” cartridges were made in Germany by Dornheim („Gecado“). John “Pondoro” Taylor wrote: “… the Jeffery .500, the ammunition for which was only obtainable in Germany.” The metric chamber, cartridge and barrel dimensions as well as the max pressure were all published with the German 1940 proof law. The 1940 RWS handbook listed it with a 534 gr steel jacketed bullet and 108 gr Rottweil R5 smokeless powder for a mv of 2490 fps from a 27.5” barrel, pressure 3200 at (copper crusher). Most likely the cartridge was never loaded using British Cordite. The only prewar original Jeffery rifle I encountered has a Schüler chamber.
This was the state of affairs until Mr. Little mixed things up when Kynamco started production. Instead of working with the long established and CIP registered dimensions of the 12.7x70 Schüler, he decided to reinvent the wheel. Apparently he worked from an obscure drawing of a cartridge from the Kynoch archives (the company had never sold such a cartridge!), designed chambering dimensions around it and registered the whole shebang as the „proper dimensions“ for the .500 Jeffery. Now Kynoch had put a much shallower shoulder angle (for ease of manufacture?) on their cartridge drawing. (remember, British chambering/ cartridge dimensions were often quite sloppy in pre-war times.) The dire results are:
1) There are now two sets of different dimensions for the 12.7x70 aka .500 Schüler and the .500 Jeffery.
2) Kynamco`s cartridges will work ok in an original or Schüler chamber (with a lttle bit of fireforming the shoulder area), but original or Schüler dimension cartridges will not go into Mr. Little`s chambers.

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Subject	Posted by	Posted on
500 Jeffery	Ithaca375	02/06/21 12:57 PM
Re: 500 Jeffery	tinker	02/06/21 01:09 PM
Re: 500 Jeffery	Ithaca375	03/06/21 10:25 AM
Re: 500 Jeffery	3DogMike	03/06/21 01:31 AM
Re: 500 Jeffery	xausa	03/06/21 04:03 AM
Re: 500 Jeffery	grandveneur	02/06/21 04:17 PM
Re: 500 Jeffery	93x64mm	02/06/21 10:16 PM
Re: 500 Jeffery	Ithaca375	03/06/21 10:37 AM
Re: 500 Jeffery	3DogMike	03/06/21 12:11 PM
Re: 500 Jeffery	Ithaca375	03/06/21 01:23 PM
Re: 500 Jeffery	500Boswell	03/06/21 07:11 PM
Re: 500 Jeffery	Ithaca375	04/06/21 01:04 PM
Re: 500 Jeffery	500Boswell	03/06/21 07:12 PM
Re: 500 Jeffery	Ithaca375	04/06/21 01:15 PM
Re: 500 Jeffery	93x64mm	04/06/21 04:03 PM
Re: 500 Jeffery	Ithaca375	05/06/21 12:39 PM
Re: 500 Jeffery	tinker	05/06/21 01:14 PM
Re: 500 Jeffery	grandveneur	05/06/21 04:17 PM
Re: 500 Jeffery	lancaster	05/06/21 10:12 PM
Re: 500 Jeffery	grandveneur	06/06/21 12:27 AM
Re: 500 Jeffery	chuck375	03/11/21 11:49 AM
Re: 500 Jeffery	casper50	06/06/21 05:47 PM
Re: 500 Jeffery	Ithaca375	07/06/21 03:08 PM
Re: 500 Jeffery	grandveneur	06/06/21 06:20 PM
Re: 500 Jeffery	Huvius	07/06/21 11:27 AM
Re: 500 Jeffery	grandveneur	07/06/21 05:11 PM
Re: 500 Jeffery	kuduae	08/06/21 01:40 AM
Re: 500 Jeffery	grandveneur	08/06/21 02:40 AM
Re: 500 Jeffery	Huvius	07/06/21 11:35 AM
Re: 500 Jeffery	93x64mm	07/06/21 03:01 PM
Re: 500 Jeffery	Ithaca375	07/06/21 03:09 PM
Re: 500 Jeffery	Huvius	08/06/21 08:48 AM
Re: 500 Jeffery	Ithaca375	08/06/21 11:08 AM
Re: 500 Jeffery	93x64mm	18/06/21 10:25 PM
Re: 500 Jeffery	93x64mm	09/06/21 07:10 AM
Re: 500 Jeffery	lancaster	09/06/21 01:55 PM
Re: 500 Jeffery	kuduae	10/06/21 03:29 AM
Re: 500 Jeffery	JFE	18/06/21 12:34 PM
Re: 500 Jeffery	casper50	18/06/21 04:04 PM
Re: 500 Jeffery	grandveneur	10/06/21 03:40 AM
Re: 500 Jeffery	kuduae	10/06/21 05:04 AM
Re: 500 Jeffery	grandveneur	10/06/21 05:34 AM
Re: 500 Jeffery	lancaster	09/06/21 05:39 AM
Re: 500 Jeffery	DarylS	07/06/21 12:14 PM
Re: 500 Jeffery	Huvius	07/06/21 12:55 PM
Re: 500 Jeffery	3DogMike	06/06/21 06:56 AM
Re: 500 Jeffery	DarylS	06/06/21 09:12 AM
Re: 500 Jeffery	DarylS	05/06/21 01:18 AM
Re: 500 Jeffery	Ithaca375	04/06/21 01:18 PM
Re: 500 Jeffery	500Boswell	04/06/21 07:32 AM
Re: 500 Jeffery	3DogMike	04/06/21 11:07 AM
Re: 500 Jeffery	500Boswell	04/06/21 11:24 AM

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