Col Whelen also wrote an article, .270, .30-06, is there something just a little bit better? His answer was yes, the .280. But you have to be pretty serious and meticulous to tell.
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the 270 (.277 caliber and no, like 38 special it makes not sense as the name does not match the real caliber).
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Actually, RC, it does make sense. .270 is the caliber, the bore diameter of the barrel. .277" is the groove/bullet diameter