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Hunting
Long Range Hunting & Shooting
Virgin brass vs. once fired.
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<blockquote data-quote="VarmintBob" data-source="post: 2890178" data-attributes="member: 124886"><p>When brass is new, it is smaller than it will ever be after you fire it. If you have a large chamber the brass has to stretch quite a bit to swell up to fit that chamber when you fire it. Some of the energy of the shot is used to do this brass stretching. So that energy is not available to propel the bullet. Once the brass has had this initial stretch, subsequent firings have more energy to propel the bullet if you continue to use the same powder load. If you want the load to shoot the same as it did originally, reduce the powder load till you get back to that original muzzle velocity. It's almost rocket science but not quite.</p></blockquote><p></p>
[QUOTE="VarmintBob, post: 2890178, member: 124886"] When brass is new, it is smaller than it will ever be after you fire it. If you have a large chamber the brass has to stretch quite a bit to swell up to fit that chamber when you fire it. Some of the energy of the shot is used to do this brass stretching. So that energy is not available to propel the bullet. Once the brass has had this initial stretch, subsequent firings have more energy to propel the bullet if you continue to use the same powder load. If you want the load to shoot the same as it did originally, reduce the powder load till you get back to that original muzzle velocity. It's almost rocket science but not quite. [/QUOTE]
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Virgin brass vs. once fired.
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