Hi, could you please make it configurable? I think 40% is too powerful – personally, I’d like to make the damage bonus 15% or 20% instead of 40% for the fluid and 25% for the ammo.

It’d also be nice if it required an additional research, so maybe that’s an option you could consider.

I've updated the mod for 2.1, and also added a damage bonus setting, default value 1. When set to zero, the turret bonus is simply the sum of the bonuses for light and heavy oil. For vanilla Factorio, this is 15%. Each full point of bonus setting adds 20% (the light oil bonus plus twice the heavy oil bonus). It's written this way to ensure the improved ammo remains improved regardless of how other mods may have changed things. The crafting time for the fluid is also changed based on the bonus setting so higher bonuses "cost" a bit more.

The personal/tank ammo gets the same relative bonus (averaged if any modded turrets act differently), though to keep the numbers pretty it does some rounding to a multiple of 5/second.

The default bonus setting is 1, giving the turret a bonus of 35% and increasing the ammo's damage from 60/s to 80/s and its radius from 2.5 to 3. You will probably want to use a bonus value of 0.25 (turret bonus 20%, ammo damage increased to 75/s, radius to 2.8).