@The_Tibber In what world does *any* rifle have a flat trajectory out to 1km?
A 338 LM has a flat trajectory out to 200m(ish) at the expense of .50-like recoil for instance, you sure you're not confusing supersonic velocity with flat trajectory?
Effective distance is in no way/shape/form when you see bullet drop either, it's what range the bullet still has enough spin and velocity to be stable (ie; you can still predict the flight path within reason) and kinetic energy retained to damage a target to the degree expected.
This is a game though so fluffing numbers and performance is fine mind you, but using real-world as a baseline in most games is a bad idea.
Anyone who's magdumped 2-4 mags as fast as they can on an assault rifle can explain why on the most basic level, let alone firing 10-15 shots a minute sustained on a precision platform.
I'd also argue purely from a game standpoint that we've had one rifle to play with so far, and going by previous titles, odds are pretty good that we'll have higher velocity rifles with slower load times, and the one we had in the beta was the 700-analogue from previous titles (slower bullets/more ballistic arc but probably able to reload the fastest once all the mods are available and access to medium/short range optics as well as long range)
This last bit is speculation of course.