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Old November 18, 2012, 12:28 AM   #11
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Join Date: October 18, 2006
Posts: 6,223
8 mm and below is small bore. The German 8x57IS was the biggest of the cartridges allowed in "small bore" competitions. I guess since the competition rules have moved on the definition may have changed.

8 to 10 mm is medium bore. You will find a lot of reference to the 375 H&H as a "medium bore" round.

Over 10 mm is big bore.

In America small bore is now synonymous with rimfire, although I don't know how that developed. In some countries "fullbore" refers to a service rifle competition (in 308 Win).

Machine guns are awesome until you have to carry one.
Jimro is offline  
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