In short, it’s harder.
To elaborate, APBs have a light casing (usually copper/aluminium) which breaks upon impact, allowing the “penetrator” inside to continue forward with force.
These penetrators are usually made of some form of hardened steel, tungsten-carbide, or other similarly tough material; allowing for greater penetration following the impact of the light casing.
Armour piercing shells (APS), as opposed to armour piercing bullets (APB), are used to penetrate and then *detonate* through various methods.
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