I use the Apis+dante all the time. Mainly on ambus and estos. I cant remember how to do maths from school but ill give it a crack ;).
Example 320(roughly it varies) Ambu Kills
Apis + Dante ( avg 312.5 ammo per kill)
Gun Decay(with mu) 500ped
Decay (amp, armor, fap) 276ped
Ammo 1000ped
Time...