What does DR mod% and Dmg mod A and B mean?

Sn1p3r187

Carolinian Shaolin Monk
I'm sorry I'm terrible at math. What do they mean? I'm using Fallout 2 editor at the moment and I want the .45 Caliber and the 7.62 to have a bit more power than the 10mm and .223 FMJ. How would I go about this and what exactly do they mean or represent?
 
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