And then there are things like the 450bpe, 450#1, 450#2, 450Rigby, 400Jeffery and 404Jeffrey, 400H&H, 400/360, 450/400NE and 450/400NE-3-1/4, 297/250Rook,295/300 Rook, 300Sherwood.
Have to do a wee bit of reading to sort some of the English cartridges out, many are not what they seem to be, by the name. And then the Europeans had to rename some of them to metric designations.
If you think of a "new" cartridge, and you think it hasn't been done already, you very likely could be wrong, or just a couple of thou out on one of the case length or shoulder or neck measurements.
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