I'm trying to remember exactly where I read it but there are apparently two versions of the .275 Rigby. It all depends on how the rifle is throated. Some are throated fir the use of 140 gr. bullets and appaently you can't go with the 175 gr. bullets in that one. The other is throated for the 175 gr. bullets as are most 7x57 rifles. For all I know, the barrels may also have a different twist rate as well. I'm thinking it might be John Taylor's book on African Rifles and Cartridges that had the info. I'll see if I can look it up when I get time.
Paul B.
Our forefathers did not politely protest the British.They did not vote them out of office, nor did they impeach the king,march on the capitol or ask permission for their rights. ----------------They just shot them.
MOLON LABE
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