ShortBus, you should go, nay, run down to your local library and get your hands on the bible, by this I mean "Jane‘s Infantry Weapons & Small Arms." You can pick the year. Then I suggest you absorb that book, it will be an excellent starting point and open your eyes to many wonderful things. Jane‘s and other like minded publications kids will provide you with many accurate details that the info boxes from Rainbow 6 and SOCOM just aren‘t able to provide.
Having said that, I‘ll answer your question. First, I was being sarcastic when I responded to Aries because I‘m getting tired of these asinine queries. You need to understand, killing is a serious thing, you cannot take that back. There is no "retry" with this. Professionalism is a mindset, something to be taken seriously and actions will speak the level of yours. Although the majority of the worlds "soldiers" are no more than children and teens these days, this is a grown ups game. Especially in the CF for if you ever go overseas, you will most likely find yourself in a situation where you‘ll have to exercise restraint on a daily basis and then deal with the crap that you saw. You may notice that "justice" or "rights" are notions which are not always respected. The individuals doing whatever nasty thing to each other (or you) may be using sticks, machetes, mines, mortars, or Enfields and Klashnikovs from generations past. I have no doubt that a young man who has grown up with a .303 Enfield (for those of you who do not know what this rifle is, look it up) wearing robes and running through the hills on sandals will be able to engage you with your LBV, kevlar, pack and C7 @ 600m and make you wish you had something with a bit more punch. Take your time on the range seriously, those kids do almost daily. (For fun, look up the Canadian Rangers and see the firearm of choice for the Inuit supported by elements of the CF Infantry, these are the reservists in the Canadian North) The Enfield is by our standards, obsolete, using an obsolete cartridge and it looks like something your Grandpa has in his collection, but in the right hands it‘s effective.
With that said, this information is available almost ANYWHERE.
The NATO standard cartridge is the 5.56mm x 45mm SS 109. (Those are the metric dimensions of the cartridge, the first number is the diameter of the bullet itself and the second is the length) The SS 109 is a steel-core 62 grain bullet and has been the traditional round for some time, although there are many other bullets in use such as the US M193, etc... No two bullets have the same performance, by this I mean, you can vary many factors such as the weight/shape of the bullet and the amount/type of propellant you use resulting in varying ballistics. Then you have conditional factors: temperature, wind, humidity, altitude, etc...
This bullet is also known as the .223 Remington. This is the imperial measure for the bullet, by this I mean the diameter of the bullet is .223 Calibre. Click on the link below, you NEED to read this!!
http://www.reloadbench.com/cartridges/223.html
The average individual effective range of the C-7 (M-16) is 300m, the effective range is 600m when firing as a SECTION, this means your section members firing together at a target.
Now, the C-7(M-16) in the right hands with the right ammo, etc... can be accurate at ranges exceeding 600m by individual.
http://userpages.aug.com/captbarb/rifle.html
You must also read this.
This should answer your questions and give you a place from whereupon you can have an informed basis of your growing knowledge. Be a professional at all times, the world has enough psychobabies.
Cheers.