I will ignore ballistics and physics and kinetic energy here. Lets look at this from a practical standpoint. Laura-Lee Gerwing Posts: 3363 Joined: Fri 12:46 am So you can not assume that round is automatically stronger than one it replaces. Many other things matter.īye the way 5.56x45mm NATO replaced 7.62x51 NATO which was MUCH stronger round. This is very tricky and not as simple as just calibre comparison or muzzle energy. Especially because low calibre military ammunition have hard jacked and do not deform as much upon impact as soft projectiles of larger calibre. That is where larger calibre ammunition have advantage over low calibre. Energy have to be transferred in to target, otherwise its useless. lbfġ0mm is a pistol round that has a low muzzle velocity, 5mm is a fictional rifle round that supposedly replaced 5.56x45mm NATO so I would imagine it would have superior performance.Įnergy alone is as useless as diameter alone in determining its effect on target.

Real 10mm AUTO has a muzzle energy of around 750ft The diameter of the projectile has little to do with how powerful the round is.

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