*snip*
*snip*
I did a test with the BAR. Set damage to 1, burst to 10000 rounds, accuracy to 50% on all ranges, got a target with 1 target size and 10000hp, made sure no vet is applied.
A single burst round left the target with ~50%.
Then I used to 2 targets, standing next to each other. This time a single burst would not drop the hp by 50%, instead it lost about ~31% while the other model, which was not targeted, lost about ~18%.
The myth of "re-rolls" is hereby debunked.
Therefor guns with focus_fire enabled are superiour.[edited] The primary target however will be prioritized by weapons without focus_fire. By which modifiers the secondary targets are selected I can't say for sure - not of my interest though.