I don't think it matters as they pay me a flat rate and it is supposed to be skill based. Efficiency of the weapon isn't proven to matter at this point other than how much it costs you to kill the mob. The faster you kill the big shit, the more efficient you are if it has high regeneration. Skills are supposed to influence loot, which we all know I have plenty of those. The number assigned to the weapon is irrelevant. I have a BL1950 and Mod Starkhov. If the person hiring me wants me to take longer to kill in order to use the higher "efficiency" weapon and charge them 10 PED more per kill, no problem. I don't believe that is the right mentality though.