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Clark
.275 member

Reged: 25/11/08
Posts: 84
Loc: Sweden

.275 Rigby
#127976 - 25/02/09 05:57 AM

Hello,

I have always thought that .275 Rigby was the British designation for the 7x57 Mauser caliber but according to CIP they are two different calibers and also in Cartridges of the World there are small differences in the case measurements.

I also had a discussion with a helpful man at a cartridge company who even said that the two calibers had different maximum pressures, 3200 BAR for the .275 and 3700 BAR for the 7x57 Mauser if I remember correctly. He didn´t recommend the usage of 7x57 Mauser cartridges in a .275 Rigby rifle.

Is it maybe just the .275 High Velocity cartridge with 140 grain bullet that is considered a different caliber? I thought that the actions were imported to England with barrels chambered in 7x57 and Rigby then put sights on them, engraved and stocked them.

Is there anyone here who can enlighten me?

/C

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dons
.333 member

Reged: 18/08/07
Posts: 431
Loc: Essex

Re: .275 Rigby [Re: Clark]
#127978 - 25/02/09 06:20 AM

Mauser supplied Rigby with actions and barreled actions chambered in 7x57. Rigby then stocked them, put their name on them and designated them .275 to fit in with the British system. Based on this, they are 7x57. Ammo makers may have varied things a bit.

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peter
removed

Reged: 11/04/07
Posts: 1493
Loc: denmark

Re: .275 Rigby [Re: dons]
#127980 - 25/02/09 06:28 AM

clark

you have it right the first time they are the same.

peter

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pjaln
.375 member

Reged: 08/06/06
Posts: 711
Loc: massachusetts ,U.S.A.

Re: .275 Rigby [Re: peter]
#127984 - 25/02/09 06:36 AM

could be reffering to high velocity =140 grain bullet or normal velocity 175 grain ...both are 7x57....paul

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Clark
.275 member

Reged: 25/11/08
Posts: 84
Loc: Sweden

Re: .275 Rigby [Re: peter]
#128033 - 25/02/09 06:40 PM

Thanks for the information!

Quote:

you have it right the first time they are the same.

peter

I visited your homepage in your sig and noticed that you live in Rönnede. Me and my brother do visit Hovkrog each year and shoot some pheasants as we have danish friends living there. Lovely countryside!

Cheers,
Clark

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Chincombrero
.224 member

Reged: 10/09/08
Posts: 2
Loc: Western Australia

Re: .275 Rigby [Re: Clark]
#128253 - 27/02/09 01:30 PM

I have a .275 BA Rigby, built in 1901. I believe that when Rigby introduced the 140grn (or was it 145grn? bullet - I could look it up, but I'm lazy) - they called it ".275 Magnum".
I use commercial 7x57 ammo, or military surplus, or handloads. They all chamber & extract perfectly, with no evidence of fireforming.

Does anyone know if Rigby changed the rate of twist when they introduced the lighter projectile?

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Clark
.275 member

Reged: 25/11/08
Posts: 84
Loc: Sweden

Re: .275 Rigby [Re: Chincombrero]
#129001 - 08/03/09 09:32 AM

I am curious about the rate of twist on the high velocity Rigbys too. Will there be problems shooting a heavier bullet in such a rifle or is it just the sighting of the high velocity rifles that is different from the standard rifle?

/C

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500Nitro
.450 member

Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia

Re: .275 Rigby [Re: Clark]
#129002 - 08/03/09 09:48 AM

As stated correctly above, the 275 Rigby is,
and always will be the 7 x 57.

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rigbymauser
.400 member

Reged: 15/05/05
Posts: 1972
Loc: Denmark

Re: .275 Rigby [Re: Clark]
#129020 - 08/03/09 07:04 PM

Quote:

I am curious about the rate of twist on the high velocity Rigbys too. Will there be problems shooting a heavier bullet in such a rifle or is it just the sighting of the high velocity rifles that is different from the standard rifle?

/C

I believe it was Mauser that made Barreled actions to Rigby, and I doubt mauser would deliver a 7x57 with a different twist so 175grain round nosed bullets could not be used. The sights ofcouse is regulated for the 140 grain but if the rifle are used on biggame the difference between the 140 and 175 at close range isn`t all that much to really matter.
Its funny in a way...When one are thinking: Rigby & .275, they are thinking of "Africa", but the rifle was made for use on the british isles. I have seen Rigby advertise their .275 as a stalking rifle for the scottish highlands...never seen them advertise a .275 for africa....at least not yet..haha

Edited by rigbymauser (08/03/09 07:13 PM)

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Clark
.275 member

Reged: 25/11/08
Posts: 84
Loc: Sweden

Re: .275 Rigby [Re: rigbymauser]
#129220 - 10/03/09 09:02 PM

Thanks for the info!

Yes, but probably it was used more in Africa and India than Rigby had imagined, perhaps because of the rifles being cheaper than those from the other British makers.

Cheers
Lars

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