Is 10mm big?
The short version is the 10mm has a longer case, but the. 45 ACP has a larger projectile. The 10mm also has a shorter bullet.
Is 10mm Bigger Than 45?
|10mm Auto||.45 ACP|
|Bullet diameter||0.4 in||0.451 in|
|Case diameter (neck)||0.425 in||0.473 in|
|Case length||0.992 in||0.898 in|
|Overall length||1.26 in||1.275 in|