Unfortunately, there are many poor assumptions in your post.
Bullets from a .223 can penetrate and wound more than one person. In a crowded venue, it is quite likely that one shot will hit more than one person.
So we could easily be down to 60 shots, but I suspect that the number is closer to 210, which would allow for multiple hits on many people. That would be 7 30 round magazines. The loaded 30 round magazines are not that heavy they weight a bit over a pound, or less than 8 pounds for 7 loaded magazines. Numerous reports said that he was wearing a vest, which could easily be used for carrying magazines.
Even without a vest, ordinary pockets allow for 8 magazines. The bellow pockets on BDU pants allow at least two each, that is four. Then the front pockets allow one each, that is six, then the back pockets take one each, that is eight.
It would have been easy for him to use a small day pack or fanny pack to carry more magazines or accessories.
If everyone was running away from him, reloading would be easy, and he is supposed to have 1 or 2 pistols to use in the event of being attacked while reloading, which only takes a couple of seconds with a bit of practice.
It has also been claimed that the shooter had some training.
I have been surprised that other attacks have had relatively low casualty counts. At the close ranges in this case, all under 40 feet, probably much less, hits are very easy, especially into crowds that are attempting to flee. There were over 300 people reported to be in the club, and exits were minimal, at least one blocked.
Fish in a barrel comes to mind.
Thanks for commenting on that post upthread. I was going address it myself but decided it best not to reveal how I might know certain things.
Needless to say, this is something that an individual with very little “training” could in fact execute themselves.
Especially when the guys outside wearing body armor and armed with carbines, shotguns, and handguns take close to 3 hours before they engage the shooter. And then it was only because he came out of the building.
Why didn't the police enter the building and engage the terrorist?
The kill/hit ratio is surprisingly high...but laying wounded around for three hours without medical attention seems likely to have that effect.
Oh...and NOT using automatic weapons.