How do armor-piercing ammo like the http://rage.wikia.com/wiki/Feltrite_AR_Rounds or the http://rage.wikia.com/wiki/Authority_AV2x_Rounds affect non-armored targets?

Do they cause less damage on non-armored targets, compared to their non-armor piercing counterparts (ala http://www.falloutwiki.com/.50_MG#.50_MG.2C_armor_piercing)? Or are they simply better versions of their non-armor piercing counterparts?

I'm asking because I am deciding if I should still use regular non-armor piercing ammo or not, depending on if armor-piercing ammo work better against non-armored targets.

The answer is right in the wiki itself

With this ammo, the AMG does a considerable amount of damage and is now armor piercing, being able to put down both the unarmored and armored enemies quickly. It is much more useful against the heavily armored enemies such as http://rage.wikia.com/wiki/Gearheads and the http://rage.wikia.com/wiki/Authority infantrymen.