i really need to know how to work out the calliber of something
"Caliber" is the nominal diameter of the bullet itself, in inches. A .22 caliber bullet is 0.22 inches, a .44 caliber is 0.44 inches, etc. A 6.3 mm steel ball works out to 0.248 inches in diameter (.248 caliber)...but it's quite possibly 0.250" since that's a 'standard' size.
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ps the ball is actually .328 to be precise but i didnt bother mentioning it
.328 inches, is not 6.3 mm, it's 8.3 mm. Either that's a typo, or you had trouble measuring.
the steel ball from a bearing measured 6.328mm on a digital micrometer
Okay. So 6.328 mm (not 0.328 in). NM has given you the conversion factor, so you can do the math yourself, now and in the future.
. LOL That's what you get for giving him a fish. ;)
. For future reference, there's 25.4 mm per inch.