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Right then; for those of you that are interested, my restoration gunsmith/importer/good friend Steve Bertram www.bertramandco.com has come up with some original ".275 Bore Rigby Special High Velocity Rifle" cartridges.
When I get out of our "deep freeze' Winter here I will take my .275 Rigby Mauser out and test fire 3 shots over the LabRadar to tentatively settle the question of no kidding ".275 HV for Rigby" muzzle velocity in real life.
As soon as this is done I will certainly post the results.
Who wants to go in on a betting Calcutta as to actual average muzzle velocity?  (just kidding, too hard to deliver a bottle of Single Malt to the winner)
- Mike
My guess is a conservative 2650 fps MV. Before checking Kuduae's post above. After checking I see I am right on the the middle of an expected velocity range.
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Re: The .275 Rigby is a Fantasy Cartridge