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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What would make a rifle "slow"?
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<blockquote data-quote="FearNoWind" data-source="post: 1231337" data-attributes="member: 50867"><p>First off a safety note. Flattened primers are no absolute indication of high pressure; por the absence of it. When your rifle begins to reveal signs of high pressure you've already passed the safe pressure point long before those signs appear. You can have dangerously high pressure without flattened primers, and flattened primers without dangerously high pressure. Neither does heavy bolt life necessarily indicate high pressure. The age and condition of the brass and other factors come into play when analyzing the source of heavy or stiff bolt lift.</p><p>In order to compare your results with published information you need to have exactly the same conditions including rifle specs., ammo specs., environmental specs. and technical equipment. In my experience, using only powder charges as a guide, 50fps increases require about a 1gr increase powder charge. That's a lot of powder. But, also in my experience, the greatest single factor affecting MV is barrel condition and barrel length.</p><p>Here's an article worth reading:</p><p><strong></strong></p><p><strong><u><u><a href="http://honors.usf.edu/documents/thesis/u82488180.pdf" target="_blank">http://honors.usf.edu/documents/thesis/u82488180.pdf</a></u></u></strong></p></blockquote><p></p>
[QUOTE="FearNoWind, post: 1231337, member: 50867"] First off a safety note. Flattened primers are no absolute indication of high pressure; por the absence of it. When your rifle begins to reveal signs of high pressure you've already passed the safe pressure point long before those signs appear. You can have dangerously high pressure without flattened primers, and flattened primers without dangerously high pressure. Neither does heavy bolt life necessarily indicate high pressure. The age and condition of the brass and other factors come into play when analyzing the source of heavy or stiff bolt lift. In order to compare your results with published information you need to have exactly the same conditions including rifle specs., ammo specs., environmental specs. and technical equipment. In my experience, using only powder charges as a guide, 50fps increases require about a 1gr increase powder charge. That's a lot of powder. But, also in my experience, the greatest single factor affecting MV is barrel condition and barrel length. Here's an article worth reading: [B] [U][U][URL]http://honors.usf.edu/documents/thesis/u82488180.pdf[/URL][/U][/U][/B] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What would make a rifle "slow"?
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