As far as the many bullets....I agree. The general rule is to double tap. The problem we faced was re-supply. We would find ourselves in the thick and unable to get resupply - so we had to make it count.
Haji was often doped up....it would sometimes take quite a few 5.56 to drop him. The larger calibers seemed to work better as they made bigger holes.
Good for you. Bigger holes are a good thing, but that can be obtained by bigger, heavier solid bullets, or by frangible bullets at higher velocity. The M-855 bullet turns sideways a bit slower than the M193 bullet, and on a thin target (as in Somalia, they called the locals ‘skinnys’) that best effect may be beyond where their meat is. The less dense nature of lungs also reduces the turning force on the bullet.
Double tap was invented with the idea that each bullet has about a .9 effectiveness. hit with 2 and you get .99.
If your effectiveness for one bullet is about .5, then two gives you .75, and three gives you 0.875- to get a standard effectiveness of 0.99 with a .5 prob bullet you need in excess of 6 bullets.
Soviet tactics were to use 7 to 11 round bursts with the AK, because they expected that most rounds would miss at combat distances. They used more bullets to fill in the empty space, recognizing that near misses tend to suppress rational enemies. If you had an irrational enemy (hadji) who really thought that Allah would protect him, or would permit him to die a forgiven jihadi at Allah’s good time, then suppression doesn’t really work. On the other hand, similar beliefs tend to work against marksmanship skills if Allah is thought to guide the bullet.
An enemy who fires 30 rounds in your direction, hitting with 2 with one killed and one wounded will normally be thought to be very effective. By contrast, a US soldier who fires 8 bullets, hitting with 7 and killing 2 is thought to be ineffective. That is just the nature of human psychology.