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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Custom rifle with short freebore
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<blockquote data-quote="J E Custom" data-source="post: 1219808" data-attributes="member: 2736"><p>In my opinion, Freebore is very important to control Pressure, Especially on the large over bored </p><p>cartridges. It allows the bullet to start moving before it impacts the rifling reducing the initial pressure spike and aids the bullet in the engraving of the rifling.</p><p></p><p>If you look at the SAMME specifications, You will see that most high pressure, high velocity cartridges have quite a bit of free bore for this reason.</p><p></p><p>Seating the bullet against the lands increases the pressure and reduces the velocity. The best example I have seen is in the case of a friend building a 30/378 with less than .100 thousandths</p><p>freebore. After blowing nearly every primer in factory Weatherby ammo He had to load down to prevent this and lost over 100 ft/sec in velocity. Weatherby ammo used to be loaded to the max</p><p>(Roy Weatherby wanted velocity so his claims of the fastest were true) with the shore freebore pressures were just to high, So In reality, the reason for the 30/378 was velocity, the effect was no more velocity than the 300 RUM.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1219808, member: 2736"] In my opinion, Freebore is very important to control Pressure, Especially on the large over bored cartridges. It allows the bullet to start moving before it impacts the rifling reducing the initial pressure spike and aids the bullet in the engraving of the rifling. If you look at the SAMME specifications, You will see that most high pressure, high velocity cartridges have quite a bit of free bore for this reason. Seating the bullet against the lands increases the pressure and reduces the velocity. The best example I have seen is in the case of a friend building a 30/378 with less than .100 thousandths freebore. After blowing nearly every primer in factory Weatherby ammo He had to load down to prevent this and lost over 100 ft/sec in velocity. Weatherby ammo used to be loaded to the max (Roy Weatherby wanted velocity so his claims of the fastest were true) with the shore freebore pressures were just to high, So In reality, the reason for the 30/378 was velocity, the effect was no more velocity than the 300 RUM. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Custom rifle with short freebore
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