Why was the shooter in the school for 48mins but only kill like 22 people?

Because he was locked in a single room.

There's actually a very simple answer to your question:

Children are small targets and move erratically.

This thread will inevitably be attacked by insecure feminists and manlets. Now, you might be saying "haha, you are quite repugnanted by women." No, I am not. To be fearful of the female s*x is a paradox in itself. One cannot be fearful of that which crumbles under the gaze of pure molten strength. Now, I am not one of those, ah, alpha bros. No, I took myself from that philosophy quite a while ago. You see, I am a natural man. As you should be. A man is not afraid to exhibit his sexuality in the same way those slutty girls in my college do… they don’t realize the eyes which judge them. They don’t realize that I observe every. Single. Movement. They. Make. Oh, and the feminists. Naturally, by stereotype, they come in groups. Herds, like cattle for the slaughter. They shriek their opinions. They shriek them.

Now I will get to the point. I will… don’t worry. Before the feminist witches come in and bury this comment in an underwater grave… you see. I am not angry, no, quite the contrary. I am merely… observing. Observing that which does not, no, interest me, but piques my interest, you see. And that is the female s*x. The ever so hypocritical and slobbering receptacles of hatred and submissiveness… it is disgusting. Absolutely disgusting. Yes, I have had a bad experience with females. But now that I have a more…base viewing of them, they fly to me like honey and bees. It’s hilarious as they degrade themselves to even be in my presence. Of course, I turn most of them down. You should see my Facebook. Full of pump and dumps… heh. This chick, Cherry, (fake name, don’t worry), a 9.5/10 European with a… nice personality is definitely the X-chromosome's finest concoction. Heh. But she withers. Withers because she will never have me. I know the mind of a female, my friends… Men have evolved for longer than they have, and this is a fact. It is a parasitic relationship which you must turn around and make the parasite herself submit to you.

You see, we men are being constantly undermined. Undermined until we are drowning below piles of coal. Drowning below the feigned superiority of the, ah, frailer s*x. But you see, this must be paused in its tracks. It is quite bemusing to see all these… apparent men scour like termites to the toes of their objects of lust. The emotion which seems to control the minds of the weak as manicured fingers tug the strings of their minds like puppets. It is disgusting and lowly… dehumanizing. Desexualizing. What men have been reduced to is despicable. Norse mythology used to be the prototype of masculinity…wenches being thrown every which way as they cower in a lustful trance whilst gazing upon their male superior. Their general. But now, men have become the horses which guide the carriage, ready to be whipped at any moment… disgusting… PM me if you need advice on the opposite s*x.

he wasn't using a modern weapon he was using a muzzle loading musket at best he could get off 3 rounds a minute

One of the magazines had 52 rounds in it. What kind of shitty ratio is this?

In the afghani war of American aggression, trained american soldiers averaged somewhere around 1 kill per 300,000 rounds fired. In ww2 it was 1 kill per 45,000. Are those wars fake too?

https://old.reddit.com/r/WarCollege/comments/d5d237/how_has_the_ratio_of_rounds_per_kill_in_war/

https://www.faac.com/blog/2018/01/28/killer-instinct-how-many-soldiers-actually-fired-their-weapons-in-past-wars-how-has-simulation-other-training-helped/

If you have ever tried to shoot moving targets you should know its hard even if theyre going in a straight line. Way harder if youre moving too. Probably even harder if youre locked in a room and you already killed everyone who was in there with you lol