.... Heck, spearhead suppresses infantry in 360 better than an MG42, given how it's firing from an elevated position at all times (tested, MGs suppress better if in elevated positions against yellow and green cover, eg in buildings or KT, given how projectiles are 3D vectors in this game)
Small arm fire does not have projectiles.
If you have any evidence that indicate that HMG suppers better "at all times" if firing from elevated position to cover feel free to provide it.
Cover some times does not seem to work for certain weapons if there big elevation difference at a sort distance but that is different from what you are claiming.
Small arm fire does not have projectiles (unless you are counting PTRS) and large caliber weapon have projectiles (aceept from the older " HEAT" and 17p) so there are different mechanics behind "projectiles"