Dahl Firemode bonuses

Has anyone done the testing to determine what the numeric bonuses are for the different Dahl firemodes? If so, where?

It is rather easy in game to tell that single shot has a damage boost and burst fire has a firerate boost, but it would be nice to know more details. I ask because my primary assessment criteria for most rifles is bullet damage and Dahl item cards downplay non-full-auto damage.

Well I just did a pretty quick test but it seems semi-auto mode has 20% higher base damage than full-auto.

Yes. No bonus for full auto or burst fire. Semi auto: +20% for sniper and AR, +10% for SMG and none for pistols. Multiplicative.