What about Warp Ammo & biotic primmed targets and so on? I'd say that qualifies as buffing total ammo count.
Since the total ammo doesn't go up, I do not agree that it meets that definition.
I do like the Suppressor overall, but it is not a good use of its limited ammunition to fire it without getting the large headshot bonus and that is largely the case against armored targets. It is also acute on characters who need to take Cranial Trauma to get to 1 shot kills.
In any case, for a vanilla human with max weapon damage from passive, rail 3, AP4, HVB V here are numbers:
Single Clip Armor DPS: 3838
Multi Clip Armor DPS: 2089
Total Armor Damage 50 Shots: 19442
And here is the rifle with which it is being compared
Harrier X EM+EB+AP4
Single Clip Armor DPS: 2714
Multi Clip Armor DPS: 2320
Total Armor Damage 136 Shots: 40942