.275 Rigby plinking load

4fifty8

4fifty8

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  • today tried Speer 145gr BTHP, 1.6cc~21gr Alliant 2400+polyfil, BR-2, PPU brass
  • polyfil to keep powder against primer prevent delayed ignition
  • Zastava LKM70 full stock carbine 20" barrel
  • ***non-published load - low pressure safe in my rifle only - NOT a recommendation***
  • light powder charge ~1850 fps mv groups not too bad
  • compared to hunting load 175gr GameKing @ ~2600 fps mv
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Thanks for posting, looks like a promising practise load. But I’m curious why you’d list your rifle as a .275 Rigby when it’s obviously a standard 7x57 ( 7mm Mauser?) The .275 Rigby used the same case dimensions as the 7x57 but different / shorter throat leade and slower twist. They are not the same, but are similar. Original spec .275 Rigby rifles cannot fire standard 7x57mm 175 gr, loads because they won’t fully chamber. Your hunting load looks like a real nice 7x57 load, but not appropriate for a . 275 Rigby. Am I missing something?
 
Longwalker said:
Thanks for posting, looks like a promising practise load. But I’m curious why you’d list your rifle as a .275 Rigby when it’s obviously a standard 7x57 ( 7mm Mauser?) The .275 Rigby used the same case dimensions as the 7x57 but different / shorter throat leade and slower twist. They are not the same, but are similar. Original spec .275 Rigby rifles cannot fire standard 7x57mm 175 gr, loads because they won’t fully chamber. Your hunting load looks like a real nice 7x57 load, but not appropriate for a . 275 Rigby. Am I missing something?
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I would be interested to read more about that - I was under the impression that the British Rigby Company simply imported standard German barrelled actions with standard rifling at 8.66" (222 mm) or so. I had thought British tradition was to name the thing by the size from top of rifling to top of rifling (.275"), not the bullet size - (.284"). I did have a Ruger No. 1 made for Lipsey's - it was stamped as 275 Rigby - I presumed it was just a standard 7x57 with a British name - if there was a difference in throat or twist rate, I never noticed that - that No. 1, stamped "275 Rigby", had a 2" longer barrel than did the Ruger No.1A in 7x57 that I had - it seemed to accept the same 150 grain Partition loads as I was using in the various 7x57 here. An acquaintance who has an original Mauser actioned Rigby stamped "275 Rigby High Velocity" had to have it - so it went there. When I first got the 1A, I got a box of 140 grain Partition; 150 grain and 160 grain - convinced myself that I was getting "better groups" with the 150's, so I just stayed with that weight - over 10 or 12 years I never tried any other bullet in that one - I got many dozen white tail and mule deer with that load and rifle.

At that time, Hornady sold brass with head stamp "275 Rigby" - I got a few boxes of that - they also went with that No. 1 rifle - seemed appropriate to have head stamped brass that matched to the stamp on the rifle barrel - although standard Winchester (W-W) and Remington (R-P) brass seemed to fit fine - all was reloaded on the same set-up - mostly Full Length RCBS dies, marked for 7x57 Mauser.
 
^ Damn, that's poorly written for an Englishman.

That's also the modern incarnation of Rigby. Pre-war, as Potashminer says, Mauser Werke provided barreled actions, even for the famous .416. I'm skeptical that Mauser would provide barrels with different rates of twist and chamber dimensions from the standard 7x57. I've never had opportunity to check the rate of twist on an original though.
 
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