No range modifiers, smaller dice.

In my current campaign I'm using a different dice mechanic for ranged combat; I'm not using range penalties I'm using smaller dice. A short inside normal (or short) range is rolled on 1d20.,a shot at moderate range is rolled on 1d16,  a shot at long range is rolled on 1d12. 

No math needed. No addition or subtraction mistakes in a fight and because different dice are rolled a shot feels different at short, moderate, and long range.