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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.260-Long Barrel or Short?
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<blockquote data-quote="LouBoyd" data-source="post: 558758" data-attributes="member: 9253"><p>Besides having a length barrels also have a twist rate and a chamber. They also have to work with some magazine length. SAAMI says the cartidge OAL is 2.80" but that's not good for shooting heavy low drag bullets. In picking a barrel for a custom rifle you need to decide what bullet you want to shoot and what environment you'll be shooting in, then pick an appropriate barrel length, twist rate, and chamber including the throat depth. </p><p> </p><p>Most factory 260s are sold with a standard short action 2.85" magazine. Available bullet weights in 264 caliber range from 75 to 160 grains. You won't find one barrel which is optimum for all of them. Twist rate and throat depth determine that more than barrel length. Barrel length determines what portion of the propellant energy goes to pushing the bullet faster and what portion becomes muzzle blast. Muzzle blast can be useful with a brake and longer barrels have to be heavier, especially if they're to be be stiff. Excessive muzzle pressure can hurt accuracy. </p><p></p><p>I built my most recent 260 Rem rifle using a Rem 700 long action receiver specifically so I can shoot the heavy VLD bullets. The action was from a 30-06. My handloaded cartridges are well over SAAMI OAL and they won't fit the magazine or the throat of my factory 260 Rem. That rifle has a 24" x 8" twist barrel. It won't be used for bullets under 139 grains.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 558758, member: 9253"] Besides having a length barrels also have a twist rate and a chamber. They also have to work with some magazine length. SAAMI says the cartidge OAL is 2.80" but that's not good for shooting heavy low drag bullets. In picking a barrel for a custom rifle you need to decide what bullet you want to shoot and what environment you'll be shooting in, then pick an appropriate barrel length, twist rate, and chamber including the throat depth. Most factory 260s are sold with a standard short action 2.85" magazine. Available bullet weights in 264 caliber range from 75 to 160 grains. You won't find one barrel which is optimum for all of them. Twist rate and throat depth determine that more than barrel length. Barrel length determines what portion of the propellant energy goes to pushing the bullet faster and what portion becomes muzzle blast. Muzzle blast can be useful with a brake and longer barrels have to be heavier, especially if they're to be be stiff. Excessive muzzle pressure can hurt accuracy. I built my most recent 260 Rem rifle using a Rem 700 long action receiver specifically so I can shoot the heavy VLD bullets. The action was from a 30-06. My handloaded cartridges are well over SAAMI OAL and they won't fit the magazine or the throat of my factory 260 Rem. That rifle has a 24" x 8" twist barrel. It won't be used for bullets under 139 grains. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.260-Long Barrel or Short?
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