The . 300 Winchester Magnum is a larger cartridge. They both use the same diameter bullet.
300 win.
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
.300 WM is larger in calibre, it has a longer case, and it generates more energy.
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.
If you are asking about the the cartridge length,then the 300 win mag.is longer than the .308win.caliber.If you are asking about bullet diameter then both cartridges are the same .308 bullet diameter.If you are asking about muzzle energy(hence power) then the 300 win mag.is considerably more powerful than the .308 winchester cartridge.
There is no "one" better anything- including rifle calibers. The .300 Win Mag can fire a heavier bullet a longer distance, but is generally a heavier rifle, has more recoil, and you can carry less ammunition.
No, the 300 ultra mag cartidge is not interchangeable with the 300 win mag.
The accepted dimensions of the entire cartridge for each are as follows:308 - 7.62x51mm (do note that, although dimensionally similar, 7.62 NATO and .308 Winchester ARE NOT the same round).300 WinMag - 7.62x67mm.338 Lapua - 8.58x70mmThe bullet diameters of each are as follows:308 - 7.8mm/.308 inches7.62 NATO - 7.8mm/.307 inches.300 WM - 7.8mm/.308 inches.338 LM - 8.58mm/.338 inches
Rifle chambered in one of the cartridges named Winchester Magnum- such as the .300 Winchester Magnum- or .300 Win mag for short.
Information about the 300 Win Mag, also known as the 300 Winchester Magnum can be found on the Wikipedia website. Videos about this item can also be found on YouTube.
Biggest physical difference is case size and lack of belt on the RUM
The M69 suffix identifies your 300 win mag as being a browning BAR that was made in 1969.