When speaking of ammunition it is imperative to be precise with your numbers. The .308 Winchester is interchangable with the 7.62 NATO military round
The 6.8 mm SPC is a new cartridge being considered by the US military. About the same length as the current 5.56 cartridge used in the M16 rifle, it has a fatter bullet- about .277 caliber.
If you are talking about the 7.62x51 and the .308 Winchester then yes they can safely be interchanged
Not even close.
The most common .22 rifle cartridge is the .22 Long Rifle (that is the name- it can also be used in pistols). A loaded cartridge is just under 1 inch long (25mm, or .985 inches) It has a lead bullet that is .223 inches in diameter (5.7mm). The cartridge case with no bullet is .590 inches long (15mm) There ARE other .22 cartridges- the .22 Short is the same diameter, but shorter. The .22 Magnum is slightly fatter, and longer than the Long Rifle cartridge. The .22 Long (not Long Rifle, just Long) is rarely seen today.
No reference for a savillion rifle. If you mean civilian, same as for a military rifle- it will depend on the caliber and barrel. Military rifles in the US are made by civilian companies.
No. The WSM stands for Winchester Short Magnum. They are not interchangeable.
In terms of power, or diameter? A .22 has a bullet diameter of .223 inches, the same as the .223 Remington and 5.56 military cartridge. The .222 Remington actually has a bullet diameter of .224 inches.
The Springfield Armory M1A rifle is the commercial variant of the military M14 rifle, chambered in 7.62x51 NATO. this is essentially the same as the .308 WIN chambering of the commercial M1A.
.270 refers to the caliber of the rifle. It fires a center fire, bottle necked cartridge. The parent cartridge is the 30-06, which is necked down to fire a smaller diameter bullet- .270 instead of .308. A very versatile long range hunting cartridge with moderate recoil. I think every major rifle maker in the US has built guns in this caliber.
22 hornet is a 22 calibre rifle. Most think of a 22 rifle as a rim fire rifle. But it shoots a 22 calibre bullet but the cartridge case that fires the bullet is no where near the same. The Hornet holds much more powder and is center fire.
Depends on which military. US uses the M16A1 rifle, or the M4 carbine version of the same.