I am not a munitions expert... but have found a few things that make two shots more logical... (correct me if I’m wrong)
I am not stating police office committed the murders and Abduction... please look at article below from recently retired LA POLICE officer. Somewhat nicely explains OO lethality.. it’s essentially the equivalent of 9 9 millimeter shot at once.. so 2 shots is 18 bullets... that would explain statements someone shooting up door.. when in reality 1 shot would look like 9 shots...
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Close Quarter Battle (CQB)
The traditional “meat and potatoes” of the shotgun has always been its devastating role in close quarters battle. Loaded with heavy buckshot, the shotgun places multiple high-energy projectiles on the target instantly. Several years ago, I was having a conversation with another SWAT operator about how devastating the MP-5 submachine-gun was. He was discussing cyclic rate and accuracy and boasting the sheer power coming from the sub-gun. He described how he could put 60 rounds (with a mag. reload) of 9mm ammo into a target about five yards away in less than eight seconds. While I agreed with him, I mentioned the similarity of the Benelli shotgun that I was currently carrying. He was puzzled for a moment until I pointed out that my semi-auto Benelli M-1 could hold nine rounds of .00 Buckshot ammo, and that each pellet of buckshot was approximately a .33 caliber lead projectile moving over 1,000 feet per second (slightly smaller, but similar to the 9mm or .35 caliber projectile he was firing).
I then explained that I knew several officers (including me) who could fire that Benelli fast enough to empty all nine rounds into the target in about two seconds. That meant we could fire 81 rounds of near 9mm ammunition in less than three seconds. In a comparison of fire power and speed, that shotgun was faster than any sub-gun I had ever used or knew of. My point is that in a CQB range, the shotgun (loaded with heavy buckshot) is absolutely the most devastating firearm in the police inventory.