I just finished an article where I learned that the .275 Rigby is nothing more, or less, than the 7X57. I find it rather interesting that a major gun maker would mark their weapons in such a confuseing way, since I don’t recall anyone labeling ammo as .275 Rigby.
Was this done for other calibers?
Is there a known reason why Rigby did this?
The article was centered around the accomplishments of W.D.M. Bell with this caliber in his professional ivory hunting days and mentioned that Bell preferred military ammunition because commercial rounds of 7x57 were less reliable, due to splitting cases. Since Bell was hunting in areas I presume were controled by Great Britain, what would have been his most likely supply of military ammunition prior to WWI? (I don’t recall GB ever using the 7X57 for military use.)