Which caliber bullet is bigger, the .30-06 or 7 mm? - Quora
Answer (1 of 9): 30–06 is larger. It's about 30/100ths of an inch. 7mm is about 28/100ths of an inch. For future reference, each millimeter is approximately 4/100ths of an inch. This is useful, but not precise, since the way each round is measured can differ, depending on whether the projectile o...