<Accidentally split off of the Double Damage Modifier thread.>
Shock Rounds go off once then destroy themselves. See this thread.
Basically you get the first instance of damage from the gun (whatever that is), Shock Rounds do a point to all non-heroes, Shock Rounds destroy themselves, then the rest of the gun's instances of damage happen (one at a time).
That would then apply to all ammo cards; or do Hollow Points last for the entire burst since they boost the damage power of the gun card itself rather than generating an effect before destroying themselves?
(And the thread link you supplied appears to be broken)
Shock Rounds is worded differently to the others. The others explicitly modify the damage of the power. shock Rounds adds a rider to the power, so you'd resolve the power first, then Shock Rounds would go off and destroy itself. The power is not used until it is finished, so shock Rounds, uniquely among the ammos, goes off after the power.
Apologies, folks - hit the wrong button and accidentally split this off from the original thread… 
Unfortunately, there's no undo and no way to move posts between threads. 
Am i right in assuming that if Fixed Point were in play, and thus the Shock Rounds were indestructible, they would trigger with every hit?
No
They trigger on the power use, not the hits. They are worded differently to the other Ammos and only trigger once per power. People are trying to make it far too complex.
Excellent! Just wanted to be sure.