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Now, in this unique situation where your targets are literally adjacent in very close confines, you can actually split the burst between them, "walking the shots" as it were.
So you'd fire down into the crowd, spend say 15 ammo for +5 on Burst 3, have your Prof 2 Ballistics 2, that's a wonderful pool of 9d10, and then you're walking it across let's say 4 targets with the Co-Processing, which of course is -3 because it's -1 per target past the first, you end with 6d10 in an attempt to slamfire down into a group of clustered targets.
Though you might actually as well have simply FA'd the lot for 10 ammo, this is possible.
It's also possible to do in another way - you build up your 9d10 pool, then split it out between targets, let's 3d10 to each, which is how people without Co-Processing split out dicepools, they simply assign them as possible instead of paying -1 to generate the ability to hit an additional target.
Anyway, so, maybe walking the bursts COULD be what you intended to do.
But then we enter the horrifying little fact of the problem that you sorta need to <span class="mu-s">acquire a target</span> to avoid having your functional attack pooled halved, because if you are simply spraying bullets willdy down-range at a fast amount of targets they'll go everywhere but not quite where you're aiming and I think we can both agree, Agent, that if you are 'magdumping wildly into a zone' you don't have a particular target in mind.
So doing the above walking the burst trick, at some point, the universe will start going "yeaaah that's... half a pool...". You don't have to worry about that on your end, but you should just be aware that it's not that easy.