From what I know, the reason the Vickers is so good at killing and bad at suppressing is because it has relatively low suppression values per bullet while having high DPS (slightly more than M2HB and HMG 42), so its burst will deal more damage because the suppression damage reduction kicks in later. 
The HMG 42 and the M2HB have much higher suppression per bullet so the suppression should kick in just before they get to kill a model. 
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