Greetings All,
There is a bigger gap between .276 (7mm) and .300 (7.62mm or 30 calibre) than .218 (22 calibre) and .236 (6mm). No one seems keen on filling this one. Italy and others had a 7.5mm at one time and there were some .280 calibres but they are all gone. I have given bore dia as this is generally what is referred to as calibre.
Regards Grandpamac.
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