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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 WM vs 300 WSM .... continued ....
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<blockquote data-quote="Bart B" data-source="post: 644468" data-attributes="member: 5302"><p>Differences happen because one persons barrel may shoot the very same ammo faster than another. And if they're the same length, then one's got a different bore and groove diameter; tight barrels shoot the same load faster.</p><p></p><p>Then there's the huge spread in peak pressure folks use for a given bullet in a given barrel length. Us humans are a poor judge of peak pressure looking at primers and measuring case bulge. And no two humans shooting the same rifle and ammo as the firearm is hand held against ones shoulder while the fore end rests atop somthing on a bench. As much as 90 fps spread's been measured.</p><p></p><p>SAAMI's web site has good data on what one can expect for an increase in muzzle velocity with different barrel lengths. They use identical barrels differing only in length shooting the same load having the same peak pressure. Check it out from page 22 in the link below....</p><p></p><p><a href="http://www.saami.org/specifications_and_information/publications/download/206.pdf" target="_blank">http://www.saami.org/specifications_and_information/publications/download/206.pdf</a></p><p></p><p>.....then make your own decisions as to how long you want your barrel to be.</p></blockquote><p></p>
[QUOTE="Bart B, post: 644468, member: 5302"] Differences happen because one persons barrel may shoot the very same ammo faster than another. And if they're the same length, then one's got a different bore and groove diameter; tight barrels shoot the same load faster. Then there's the huge spread in peak pressure folks use for a given bullet in a given barrel length. Us humans are a poor judge of peak pressure looking at primers and measuring case bulge. And no two humans shooting the same rifle and ammo as the firearm is hand held against ones shoulder while the fore end rests atop somthing on a bench. As much as 90 fps spread's been measured. SAAMI's web site has good data on what one can expect for an increase in muzzle velocity with different barrel lengths. They use identical barrels differing only in length shooting the same load having the same peak pressure. Check it out from page 22 in the link below.... [url]http://www.saami.org/specifications_and_information/publications/download/206.pdf[/url] .....then make your own decisions as to how long you want your barrel to be. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 WM vs 300 WSM .... continued ....
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