NO the .223 is a totaly diffrent round than the .223 WSSM
.223 inches in diameter, typically 45 to 55 grains for the .223 Remington, and 80 grains for the .223 Wylde.
No.
No
Very similar to, but not exactly the same as .223 Remington.
@ 18,500 feet
The round used by the military is the 5.56x45 round, not the commercial .223 Remington - although dimensionally similar, they are not identical. Some Designated Marksmen use it, but a dedicated sniper would not use it.
No. The two rounds are not interchangeable.
Yes, a .308 Winchester round is generally considered more powerful than a .223 Remington round. The .308 Winchester has a larger bullet, more powder behind it, and generally produces higher muzzle energy than a .223 round. However, the suitability of each round depends on the intended use and personal preference.
I wouldn't. Range of 9mm is 50 yards. Only good for close up work. Magazines are hard to come by. 5.56 or 223 has a range of 300-600 yards, ammo is easily available, magazines are everywhere.
Yes
No. They're dimensionally similar, but vary in several aspects, and may not always be interchangeable. Generally speaking, most 5.56 chambers will do just fine firing .223 ammo, but it's not recommended to use 5.56 ammo in a .223 chamber. The one exception to this would be the 80 grain .223 Wylde - a round which specifically requires a .223 Wylde chamber.