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Rifles, Reloading, Optics, Equipment
Reloading
brass weight sorting
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<blockquote data-quote="Bart B" data-source="post: 562442" data-attributes="member: 5302"><p>I totally agree with paragraphs 1 and 2.</p><p></p><p>A friend tested primers years ago by threading a BB gun barrel into a .17 Rem. shot out barrel right in front of the case mouth. Cases' primer pockets were reamed out to hold large rifle primers and flash holes drilled out to the correct size of about .045 thousandths. He shot BB's stuffed in .17 Rem. case mouths and recorded their velocity through a chornograph. Primers producing the lowest velocity shot the most accurate in both .308 Win. and .30-.338 Win. Mag rifles. The best primers for accuracy did not always have the lowest spread in velocity; some shot BB's pretty fast with low velocity spreads but those hotter ones played hell and high water with accuracy.</p><p></p><p>Another guy I know weighed primers before seating, recorded the weight to the hundredth of a grain on the case then weighed them again after firing them. The difference in weight was what he thought the primer mixture and seal weighed. He didn't see any correlation between uniform primer mix/seal weight and best accuracy. </p><p></p><p>Some folks believe the man stirring the priming mixture slurry into a homogenous puddle then smearing it into the holes in the pelleting plate is the key to uniformity. This is oft times been called the "black magic" process in the ammunition industry.</p></blockquote><p></p>
[QUOTE="Bart B, post: 562442, member: 5302"] I totally agree with paragraphs 1 and 2. A friend tested primers years ago by threading a BB gun barrel into a .17 Rem. shot out barrel right in front of the case mouth. Cases' primer pockets were reamed out to hold large rifle primers and flash holes drilled out to the correct size of about .045 thousandths. He shot BB's stuffed in .17 Rem. case mouths and recorded their velocity through a chornograph. Primers producing the lowest velocity shot the most accurate in both .308 Win. and .30-.338 Win. Mag rifles. The best primers for accuracy did not always have the lowest spread in velocity; some shot BB's pretty fast with low velocity spreads but those hotter ones played hell and high water with accuracy. Another guy I know weighed primers before seating, recorded the weight to the hundredth of a grain on the case then weighed them again after firing them. The difference in weight was what he thought the primer mixture and seal weighed. He didn't see any correlation between uniform primer mix/seal weight and best accuracy. Some folks believe the man stirring the priming mixture slurry into a homogenous puddle then smearing it into the holes in the pelleting plate is the key to uniformity. This is oft times been called the "black magic" process in the ammunition industry. [/QUOTE]
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