The cartridge will do the job if you have the skills.
Neither is "better". They are each fine in their own right.
Each one has its uses.
The AR 15 is a rifle, not a caliber. the .223 is a caliber. Usually the AR-15 is made in caliber .223.
If you always got perfect grades one point isn't going to hurt you. If you had perfect grades you would have formed your question better.
Depends on the application. If you mean power, the higher the caliber, the more powerful it is. for example, a .22 caliber rifle is much less powerful than a .50 caliber rifle.
7.92x57mm, better known as 8mm Mauser. Same caliber as the German military's Mausers.
Perfect World International I think is better.
I'm not familair with a rilfe known as a 227, but in general, no one caliber is "better" than another caliber- they are useful for different things.
Perfect World.
In my opinion the samsung finesse is better. :)
Raven Arms MP-25 is one of the .25 caliber handgun with that insignia. Check it at http://hometown.aol.com/jtjersey/Raven/raven.htm If the pictures on the above link matches the shape of your gun, then your question is answered. Otherwise it would be better for you to show a picture of that particular firearm so that people can answer your question more precisely.
It depends to an extent on what you are trying to do.