Does a 270 caliber bigger than a 30-30 round?

Yes, a .270 caliber round is larger than a .30-30 round in terms of bullet diameter. The .270 Winchester typically uses a bullet that is .277 inches in diameter, while the .30-30 Winchester uses a bullet that is .308 inches in diameter. However, the .30-30 is generally considered a heavier bullet for hunting, while the .270 is often favored for its flatter trajectory and longer range.