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Old November 16, 2012, 07:49 AM   #5
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,827
In NRA competition, small bore refers to .22 rimfire rifles.

Years ago, a neighbor who hunted big game in Africa said the British system called small bore anything below 30 caliber. Medium bore was 30 to 40 and big bore was any caliber over 40.

There's probably a few different naming conventions. Different strokes for different folks. . . . . .

http://www.chuckhawks.com/medium_bore.htm

http://www.chuckhawks.com/intro_big_bore.htm

Last edited by Bart B.; November 16, 2012 at 07:56 AM.
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