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

kuduae
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Reged: 13/01/10
Posts: 1756
Loc: middle of Germany
Re: The .275 Rigby is a Fantasy Cartridge
      21/01/23 11:36 PM

As 3DogMike asked for it:
Rigby indeed advertised the 3000 fps muzzle velocity of their 140 gr load in the early 1900s. At that time the “measuring” of bullet velocities was still in it’s infancy. Up to after WW2 there were no electronical devices, only mechanical ones. The gold standard was the Le Boulenge’s falling rod apparatus, but even that required a lot of guesswork and was very expensive. The readout was for an average over longer, more than 10 meter distances only and required calculations for the velocity at the muzzle. So cataloged velocities were usually guessed at and rounded up.
As Rigby had their cartridges loaded by Kynoch, a look at the Kynoch tables may help. In their 1925 catalog Kynoch listed the 7 mm (.276) Mauser Rifle 140 gr pointed bullet load with 43 gr smokeless at 2800 fps, no barrel length given.
An undated ca. 1930 ICI/Kynoch catalog gives these loads:
.275 Rimless (Rigby): 140 gr bullet, 43 gr. N.C., 2750 fps from 28” barrel, pressure 18 tons/sq.in.
7 mm (.276) Mauser: 140 gr bullet, 48 gr. N.C., 2900 fps from 29“ barrel, 18.5 tons/sq.in.
7 mm Rigby Magnum: 140 gr bullet, 40 gr N.C., 2675 fps from 29.5” barrel, 17 tons/sq.in. (maybe Rigby’s rimmed version?)
The .275 Rigby is listed with a lower velocity and pressure than the 7x57 Mauser. A bit confusing, but it matches the now CIP maximum pressures, 3900 bar for the 7x57 and only 3200 bar for the .275 H.V. Rigby.
Comparable German 1930s 7x57 loads were:
DWM: 139 gr bullet, 49 gr R2 powder, 2697 fps, 2800 atm, 26” barrel
RWS: 139 gr bullet, 49.5 gr R2, 2776 fps, 2850 atm pressure, 26” barrel
So the .275 Rigby 140 gr “High Velocity” load is a far cry from a “hot loaded 7x57”. I would expect 2600 to 2700 fps from a 24” barrel.

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Subject Posted by Posted on
* The .275 Rigby is a Fantasy Cartridge CarlsenHighway 18/08/22 09:04 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   27/01/23 04:58 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   27/01/23 08:39 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge JHeath   16/08/23 12:52 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   28/01/23 09:26 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   29/01/23 02:32 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   29/01/23 08:03 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge Marrakai   29/01/23 11:06 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   29/01/23 03:26 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   18/08/22 03:55 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   29/01/23 09:14 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge Huvius   30/01/23 12:13 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge chuck375   12/05/23 07:56 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Huvius   12/05/23 10:57 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   22/05/23 03:43 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   22/05/23 08:08 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge JHeath   16/08/23 01:15 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DORLEAC   16/08/23 02:06 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   16/08/23 02:12 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge chuck375   12/05/23 12:08 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge LRF   12/05/23 08:54 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge chuck375   22/05/23 04:36 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   30/01/23 11:52 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   18/08/22 04:47 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge JHeath   16/08/23 12:36 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   18/08/22 07:29 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge cooch   18/08/22 07:49 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge CarlsenHighway   18/08/22 09:43 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge lancaster   19/08/22 02:37 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   19/08/22 07:51 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge crshelton   19/08/22 10:07 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   20/08/22 01:25 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   20/08/22 01:40 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge lancaster   20/08/22 02:41 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge sharps4590   20/08/22 10:14 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   27/01/23 05:05 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   21/08/22 02:39 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Marrakai   21/08/22 09:38 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   17/01/23 02:12 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   17/01/23 01:19 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   18/01/23 12:26 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   18/01/23 05:06 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   18/01/23 08:22 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   18/01/23 08:26 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Marrakai   18/01/23 10:18 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   18/01/23 11:20 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   20/01/23 10:53 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   21/01/23 05:11 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   21/01/23 05:37 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   21/01/23 08:37 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge lancaster   22/01/23 01:47 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   23/01/23 05:05 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   26/01/23 12:49 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   26/01/23 04:29 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge Marrakai   26/01/23 06:40 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   27/01/23 03:23 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   27/01/23 05:18 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge eagle27   27/01/23 08:18 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge tinker   26/01/23 02:20 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   22/01/23 02:16 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   22/01/23 02:54 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge lancaster   22/01/23 06:16 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   22/01/23 08:42 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   22/01/23 11:46 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge DarylS   23/01/23 04:59 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge kuduae   21/01/23 11:36 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge lancaster   22/01/23 01:45 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Rothhammer1   29/01/23 08:51 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge NitroXAdministrator   20/01/23 11:20 PM
. * * Re: The .275 Rigby is a Fantasy Cartridge 3DogMike   21/01/23 05:32 AM
. * * Re: The .275 Rigby is a Fantasy Cartridge Huvius   19/08/22 01:45 AM

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