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Rifles, Reloading, Optics, Equipment
Reloading
New rifle and some questions
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<blockquote data-quote="Doom2" data-source="post: 2171362" data-attributes="member: 108323"><p>As for velocity, you noted that your barrel is 2" shorter than SAMMI test which can account for about 50 fps. Also SAMMI test chambers are tight and most commercial chambers are more generous. That typically contributes to lower velocity versus manufacturers test data. </p><p> </p><p>As for the short chamber, that seems strange. I don't have a Ruger Am. but most factory chambers are typically long. Hopefully others can help here. </p><p></p><p>The velocity/pressure relationship that is published is for a particular combination of powder and components that were tested. When other componts, powder lots, chambers, etc, are used that relationship changes. Some rifles can go over book max and others can't. Some will reach published max velocities and some will not. That being said, if your desire is for accuracy, most bullets and rifles will typically achieve best accuracy at less than maximum chamber pressure and velocity.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="Doom2, post: 2171362, member: 108323"] As for velocity, you noted that your barrel is 2” shorter than SAMMI test which can account for about 50 fps. Also SAMMI test chambers are tight and most commercial chambers are more generous. That typically contributes to lower velocity versus manufacturers test data. As for the short chamber, that seems strange. I don’t have a Ruger Am. but most factory chambers are typically long. Hopefully others can help here. The velocity/pressure relationship that is published is for a particular combination of powder and components that were tested. When other componts, powder lots, chambers, etc, are used that relationship changes. Some rifles can go over book max and others can’t. Some will reach published max velocities and some will not. That being said, if your desire is for accuracy, most bullets and rifles will typically achieve best accuracy at less than maximum chamber pressure and velocity. Hope this helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New rifle and some questions
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