Depends on which .300 cartridge you had in mind... for default, we'll go with .300 Winchester Magnum, which is basically a .308 with a longer casing (67mm vs. 51mm). The .300 WM is the more powerful of the two.
Depends on the load
308 Rifle can hit a target over 300 yards away. The military used them as sniper rifles and they r more accurate than a .223
The .243. It's basically a necked down .308 Winchester.
A Remington 308 rifle is a very powerful rifle that should only be made available to qualified individuals. This kind of rifle can be found from Gun Broker.
100-300 USD
It is a more powerful cartridge. The .300 Win Mag tops out at about 4000 ft lbs of energy, vs the .308 at 2800 ft lbs
The cartridge in question is the .300 Winchester Magnum, and not the .308 WinMag. The .308 cartridge is about 16mm shorter than the .300 Winchester Magnum casing. The two are NOTinterchangeable.
Both calibers have alot power but the 7mm is more powerful due to the fact that the bullets of the 7mm are in a higher grain than the .308. The 7mm also has a much higher recoil than the 308 and even the 30-06, both calibers have a high standard of performance but its no question the 7mm remington is more powerful
300 or so
Both fire the same diameter projectile.
The .308 was too powerful for an assult rifle, but the US Army gave it their best try in the 1960's, equipping the M14 rifle with numerous modifications to make it into an assault rifle. As a squad auto weapon it was probably quite adequate, but the .308 was just too powerful a round for use in weapons defined as assault rifles. If other armies tried to develop an assult rifle using the .308 cartridge, nothing ever came of it to the best knowledge of this contributor.
It is a rifle, 100-300 or so