What caliber is it?
-.45 ACP. It's a derivative of a Colt 1911 pistol (commander model) which is still THE gun for lots of pistol racing sports etc.
What's it's main intended use? Target Shooting? Self Defense?
-Self defense. I would have no use for it. It is too light-framed for my sport which requires MANY many rounds per year, also short-slide/barrel is less than ideal, and also .45 which is too expensive and too powerful/kicks.
How powerful is it?
.-45 ACP is plenty powerful. It's a slow heavy bullet designed to stop an attacker very effectively. Used to be the main military sidearm.
How accurate is it?
-Accurate enough to hit a man-sized target easily at maybe 40 yards or so. --Not for longer shots really. one to 25 metres is ideal.
How many shots does a clip hold?
-Looks like that's a single-stack, so seven.
Why would someone feel they need to have 4 loaded clips of ammo? (it's got 1 in and 3 on the side)
-Well, it's only 7 per clip. In my shooting discipline one quick 'stage' of racing might have a minimum shots count of 32. And you may have to fire a few extra if you miss a few or hit them less than perfectly.
-I always carry 4 clips on me; start every stage with 18 in clip one in barrel, and the next 2 mags have only 17 in them, and the last 16. Sometimes that's not enough and you run out of ammo anyway in the middle of the race.
-One one-day competition might require anything from 90 to 300 shots.
Why would someone leave it loaded, with the safety off, without a gun lock on it, in an unlocked case, on the top shelf of a bedroom closet instead of in a locked safe?
- They're being stupid.
Does it take much strength to lift it, aim it, fire it?
No. It weighs under a kilo loaded. Triggers are usually very light.
If a 6-year old girl got her hands on it, could she pull the trigger?
- If it was left with a loaded chamber, it'd be really easy. Even if safety on, on 1911 the safety is designed so it practically comes off when you start to aim, fingers hit it just right. If it had a full full clip an inexperienced shooter probably would also fire a second shot right off due to kickback/surprise/reflex .
IF it the chamber is empty, then it requires perhaps more power than a 6-year old could muster, and/or technique to pull back the slide and release it again to load the chamber.