7.62 x 51 mm NATO or 308 Winchester

The 308 Winchester started as a military round used in the M14 rifle. Originally adopted as the 7.62 M80 . The maximum allowable pressures by SAMMI standards of the commercial 308 Winchester are considerably higher than the 7.62 x 51 Nato standard of 50,000 psi. That being said it is rare indeed for any major manufacturer to load to maximum pressures.

The "308" has spawned a number of related rounds such as the 243 Winchester,the 7mm O8, 358 Winchester, and the 307 Winchester which is a rimmed version of this cartridge.

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7.62 x 51mm NATO
Jacketed Bullet Diameter (Inches)	0.308
Rim Diameter (Inches)	0.473
Base Diameter (Inches)	0.470
Max Case Length (Inches)	2.015
Max OAL Cartridge Length (Inches)	2.810

Some things to note about the reloading data on this page;

I am only relating my personal experience with the firearms and equipment that I own and that I am not making any loading recommendations.
If you use the loading data here, you do so at your own risk.
Unless stated otherwise, muzzle velocities listed on this page are from my own test data.

7.62 x 51 mm NATO Cast Bullet Loads

7.62 x 51 NATO - 308 Winchester
Bullet	0.309" dia. 187 grain LRNGC Lee C309-180-R
Powder	23.5 grains IMR 4227
Primer	CCI 250
Cartridge Case	Federal
Firearm	Spanish FR7
Barrel Length	21.0 inches
Avg Muzzle Velocity	1843 feet per second

Standard deviation 27.4 fps

7.62 x 51 NATO - 308 Winchester
Bullet	212 grain Lead Round Nose Gas Check
Powder	25.0 grains IMR 4198
Primer	CCI #34
Cartridge Case	Remington
Firearm	Spanish FR7
Barrel Length	21.0 inches
Avg Muzzle Velocity	1743 feet per second

Standard deviation 21.7 fps

Other cast bullet loads that I use for 308 Winchester - 7.62 NATO can be found at this page of reduced power rifle loads.