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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length vs *Usable* Barrel Length
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<blockquote data-quote="mgood" data-source="post: 1231599" data-attributes="member: 91188"><p>Does anyone ever consider that a 24-inch barrel on a 308 Winchester has has over a half inch more rifling than a 24-inch barrel on a 30-06 Springfield? Since barrel length is measured down to the bolt, and the longer cartridge occupies more of that length, you have more "usable" barrel in the shorter cartridge with the same barrel length.</p><p></p><p>Maybe this is so obvious to everyone that it never gets mentioned?</p><p></p><p>Since a 7mm WSM is .74" shorter than a 7mm STW, the longer cartridge needs a three-quarter-inch longer barrel to have the same amount of tube out in front of the bullet. Or stated another way, when someone says the 300 WSM compares favorably to the 300 WinMag with the same length barrel, just what is "the same length barrel"?</p><p></p><p>I'm using SAAMI lengths here. I know not everyone sticks to those, but just using them as a point of reference.</p><p></p><p>Start talking about shorter actions for shorter cartridges and you can easily have an inch more usable barrel on the same length gun (or a shorter overall length rifle with the same amount of barrel).</p><p></p><p>I'm not trying to bad-mouth the longer cartridges, whether you love the 7STW or the 416 Rigby or whatever. I'm just thinking out loud.</p><p>[Next we'll compare 40 S&W to 408 CheyTac <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> ]</p></blockquote><p></p>
[QUOTE="mgood, post: 1231599, member: 91188"] Does anyone ever consider that a 24-inch barrel on a 308 Winchester has has over a half inch more rifling than a 24-inch barrel on a 30-06 Springfield? Since barrel length is measured down to the bolt, and the longer cartridge occupies more of that length, you have more "usable" barrel in the shorter cartridge with the same barrel length. Maybe this is so obvious to everyone that it never gets mentioned? Since a 7mm WSM is .74" shorter than a 7mm STW, the longer cartridge needs a three-quarter-inch longer barrel to have the same amount of tube out in front of the bullet. Or stated another way, when someone says the 300 WSM compares favorably to the 300 WinMag with the same length barrel, just what is "the same length barrel"? I'm using SAAMI lengths here. I know not everyone sticks to those, but just using them as a point of reference. Start talking about shorter actions for shorter cartridges and you can easily have an inch more usable barrel on the same length gun (or a shorter overall length rifle with the same amount of barrel). I'm not trying to bad-mouth the longer cartridges, whether you love the 7STW or the 416 Rigby or whatever. I'm just thinking out loud. [Next we'll compare 40 S&W to 408 CheyTac :D ] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length vs *Usable* Barrel Length
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