The 30-06 ( say thirty ought six) fires a bullet that is 7.62 mm in diameter. The 7mm fires a bullet this is, well...... 7mm. 30-06 has a bigger bullet. The size of the GUN can- and does- vary. BTW- catridges such as the 7mm MAGNUM will have greater energy than a 30-06. So- what is your definition of bigger?
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