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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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<blockquote data-quote="woods" data-source="post: 646050" data-attributes="member: 6042"><p>You're right about 2 things</p><p></p><p>1. It is more Bart BS</p><p>2. Yes we are talking about head clearance rather than the strict definition of headspace</p><p></p><p>But here are some FACTS</p><p></p><p><a href="http://www.btgresearch.org/High-speed%20measurement%20of%20rifle%20primer%20blast%20waves.pdf" target="_blank">http://www.btgresearch.org/High-speed measurement of rifle primer blast waves.pdf</a></p><p></p><p>"The measurement method is simple: a firearm loaded with a primed cartridge case without any gunpowder or projectile has all the essential elements of an explosive driven shock tube whose shock wave is emitted from the muzzle after the primer is detonated by the firing pin. The blast wave measured at the muzzle depends on the strength of the primer without the confounding factors (bore friction, neck tension, powder charge, bullet bearing surface, cartridge case variations, etc.) that affect other methods of inferring primer strength and consistency."</p><p></p><p>PRIMER / PEAK PRESSURE / SD (psi) / SD (%)</p><p></p><p>Fed210 / 421.7 / 32.4 / 7.7%</p><p>Fed215M / 552.7 / 27.8 / 5.0%</p><p>CCI200 / 371.4 / 39.2 / 10.7%</p><p>CCI250 / 520.3 / 58.6 / 11.3%</p><p>FED205M / 176.5 / 20.4 / 11.6%</p><p>FED205 / 213.0 / 15.0 / 7.1%</p><p>CCI450 / 232.3 / 15.1 / 6.5%</p><p>FED205M / 208.0 / 15.0 / 7.2%</p><p></p><p></p><p>Even measured at the muzzle after passing through the case, throat and bore, the pressure was anywhere from 8 to 25 times the force of your firing pin</p><p></p><p>And how many stories have we heard (no personal experience here) about a load fired with no powder lodging the bullet in the barrel and having to take it to a gunsmith to remove it?</p></blockquote><p></p>
[QUOTE="woods, post: 646050, member: 6042"] You're right about 2 things 1. It is more Bart BS 2. Yes we are talking about head clearance rather than the strict definition of headspace But here are some FACTS [url]http://www.btgresearch.org/High-speed%20measurement%20of%20rifle%20primer%20blast%20waves.pdf[/url] "The measurement method is simple: a firearm loaded with a primed cartridge case without any gunpowder or projectile has all the essential elements of an explosive driven shock tube whose shock wave is emitted from the muzzle after the primer is detonated by the firing pin. The blast wave measured at the muzzle depends on the strength of the primer without the confounding factors (bore friction, neck tension, powder charge, bullet bearing surface, cartridge case variations, etc.) that affect other methods of inferring primer strength and consistency." PRIMER / PEAK PRESSURE / SD (psi) / SD (%) Fed210 / 421.7 / 32.4 / 7.7% Fed215M / 552.7 / 27.8 / 5.0% CCI200 / 371.4 / 39.2 / 10.7% CCI250 / 520.3 / 58.6 / 11.3% FED205M / 176.5 / 20.4 / 11.6% FED205 / 213.0 / 15.0 / 7.1% CCI450 / 232.3 / 15.1 / 6.5% FED205M / 208.0 / 15.0 / 7.2% Even measured at the muzzle after passing through the case, throat and bore, the pressure was anywhere from 8 to 25 times the force of your firing pin And how many stories have we heard (no personal experience here) about a load fired with no powder lodging the bullet in the barrel and having to take it to a gunsmith to remove it? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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