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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
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<blockquote data-quote="dirtball" data-source="post: 165223" data-attributes="member: 7344"><p>With slower powders you extend the burn time, BUT 80 to 90% of the powder is burned within the first 6+/- inches of the barrel. This results in peak pressure developing at that time. The pressure beguines to decrease after that, but even at 35" or more there is still enough pressure to continue the acceleration of the bullet. This decreasing pressure is why the amount of increased velocity that is achieved per inch of barrel length drops of so much after 29" or 30". This also varies greatly depending on case volume vs. bullet diameter. That is why they have 50 foot barrels on 16" guns on battleships, and why Kirby's AM's are so much in demand.</p><p>Dave</p></blockquote><p></p>
[QUOTE="dirtball, post: 165223, member: 7344"] With slower powders you extend the burn time, BUT 80 to 90% of the powder is burned within the first 6+/- inches of the barrel. This results in peak pressure developing at that time. The pressure beguines to decrease after that, but even at 35" or more there is still enough pressure to continue the acceleration of the bullet. This decreasing pressure is why the amount of increased velocity that is achieved per inch of barrel length drops of so much after 29" or 30". This also varies greatly depending on case volume vs. bullet diameter. That is why they have 50 foot barrels on 16" guns on battleships, and why Kirby’s AM’s are so much in demand. Dave [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
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