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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bore wear on Weatherby 338/378
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<blockquote data-quote="LouBoyd" data-source="post: 510595" data-attributes="member: 9253"><p>I own both 30-378 and 338-378 Wbys. I agree with JE custom that throat erosion is the concern and not barrel wear. Throat erosion happens when hot high pressure propellant blows though the bore and raises the surface temperature of the throat to the point it starts to melt. Smalll amouth of the surface of the bore are blown out the barrel. It only happens in the throat because the neck and chamber are protected by the brass while the pressure and temperature are lower further down the bore. The exposure time to the hot gas is also longst right at the bore. </p><p>It all has to do with the volume of propellant, the pressure, and the cross section of the barrel.</p><p>The effect is very non-linear. If the throat surface doesn't reach the melting point little metal is removed. The temperature rise and fall of the surface temperature is very short duration, only milliseconds. Hoowever, repeated firing raises the base tempearture before each shot and can dramatically reduce barrel life if the rifle gets hot. Few people shoot a 338-378 Wby rapid fire. </p><p></p><p>Some commercial cartridgs which have a repuation for being hard on barrels inclued</p><p>223 WSSM (53.7)</p><p>264 Win Mag (82) </p><p>7mm Rem Ultra (112)</p><p>30-378 Wby (133) </p><p>416 Barrett (228)</p><p>(case capacity in grains) </p><p></p><p>The 338-378 Wby isn't on that list. While it has the same pressure and a bit more case capacity than the 30-378 Wby it's larger bore increases barrel lilfe at least 50% over the 30-378. Since both of these are big game rifles and not shot rapidly or frequenty they'll last a long time for the typcal hunter.</p><p></p><p>If you consider that the typical high power rifle bullet is in the barrel only for about two milliseconds, the actual working life of most rifle barrels ranges from about 2 seconds to a minute. Maybe a few minutes for pistol caliber cartridges.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 510595, member: 9253"] I own both 30-378 and 338-378 Wbys. I agree with JE custom that throat erosion is the concern and not barrel wear. Throat erosion happens when hot high pressure propellant blows though the bore and raises the surface temperature of the throat to the point it starts to melt. Smalll amouth of the surface of the bore are blown out the barrel. It only happens in the throat because the neck and chamber are protected by the brass while the pressure and temperature are lower further down the bore. The exposure time to the hot gas is also longst right at the bore. It all has to do with the volume of propellant, the pressure, and the cross section of the barrel. The effect is very non-linear. If the throat surface doesn't reach the melting point little metal is removed. The temperature rise and fall of the surface temperature is very short duration, only milliseconds. Hoowever, repeated firing raises the base tempearture before each shot and can dramatically reduce barrel life if the rifle gets hot. Few people shoot a 338-378 Wby rapid fire. Some commercial cartridgs which have a repuation for being hard on barrels inclued 223 WSSM (53.7) 264 Win Mag (82) 7mm Rem Ultra (112) 30-378 Wby (133) 416 Barrett (228) (case capacity in grains) The 338-378 Wby isn't on that list. While it has the same pressure and a bit more case capacity than the 30-378 Wby it's larger bore increases barrel lilfe at least 50% over the 30-378. Since both of these are big game rifles and not shot rapidly or frequenty they'll last a long time for the typcal hunter. If you consider that the typical high power rifle bullet is in the barrel only for about two milliseconds, the actual working life of most rifle barrels ranges from about 2 seconds to a minute. Maybe a few minutes for pistol caliber cartridges. [/QUOTE]
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bore wear on Weatherby 338/378
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