PN - well you could look in the tactics manual and calculate your Over Target Requirement - helped by a bit of Precision Weapons calculator action...
Or you can just ‘Start whaling off stores; kill them, kill them and keep killing them until they’re dead’.
Only the seasoned campaigners or those pre disposed to spending a bit of time ‘inside’ ought to consider tactic 2. It does save you a lot of time though in zero CDE situations.