I know that cutting as many limbs as fast as possible if fighting non-boss necromorph enemies, is a good way of taking them down fast.
However, I asked this question because my currently preferred primary weapon for fighting most non-boss necromorphs is a Javelin Gun (Telemetry Spike + Default Tip), which unlike most of the other weapons, is not that good at cutting limbs. The Javelin Gun, however, is very accurate, hits almost instantly, deals a lot of damage and staggers enemies. A lot of necromorph enemies can be taken down by at most 2 bolts (if at 'Impossible' difficulty and with +3 damage upgrade chips at all slots), even if their limbs are not cut off.
So, do non-boss enemies have weak spots that I could target to get the Javelin Gun or other weapons to do more damage to them, and killing them faster with fewer shots? If yes, what are those weak spots? Do they have spots where they take less damage, too?
Another reason I asked this question is to know if non-necromorph human enemies (foot soldiers of The Circle), have weak spots. Will hitting non-necromorph human enemies in the head kill them instantly or faster? (Even if I'm not using a Javelin Gun.) Will hitting them in the limbs do less damage?