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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Double Radius vs Straight Taper Brass
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<blockquote data-quote="sable tireur" data-source="post: 1331771" data-attributes="member: 27307"><p>See what I mean...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p></p><p>This is the description I got from a Hydraulics Engineer when it came up in a discussion about the very same shoulders, maybe 25 years ago, although the time frame doesn't matter. It is simple in form but is truthful in the effect.</p><p></p><p>Plasma and fluids, such as the heated gas from gunpowder in a cartridge case and water in a water line, can and will act similarly when the water line or cartridge case is reduced in size using radiuses in the reduction joint. This can and will increase the velocity of the water or the plasma. </p><p></p><p>Now, is this a significant effect in the Weatherby cases? Probably not, although it does takes place. The downside, as pointed out, is that the plasma and unburned powder escapes the case smoothly but without the efficiency of running into a sharply angled shoulder. </p><p></p><p>One of the keys to using 30° to 40° shoulders is the reflection of the unburned powder back into the heat which is igniting that unburned powder, thereby increasing the efficiency of the charge being used. More powder burns in the case as opposed to burning with less efficiency as it's being propelled down the barrel.</p><p></p><p>Regards.</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1331771, member: 27307"] See what I mean...:rolleyes: This is the description I got from a Hydraulics Engineer when it came up in a discussion about the very same shoulders, maybe 25 years ago, although the time frame doesn't matter. It is simple in form but is truthful in the effect. Plasma and fluids, such as the heated gas from gunpowder in a cartridge case and water in a water line, can and will act similarly when the water line or cartridge case is reduced in size using radiuses in the reduction joint. This can and will increase the velocity of the water or the plasma. Now, is this a significant effect in the Weatherby cases? Probably not, although it does takes place. The downside, as pointed out, is that the plasma and unburned powder escapes the case smoothly but without the efficiency of running into a sharply angled shoulder. One of the keys to using 30° to 40° shoulders is the reflection of the unburned powder back into the heat which is igniting that unburned powder, thereby increasing the efficiency of the charge being used. More powder burns in the case as opposed to burning with less efficiency as it's being propelled down the barrel. Regards. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Double Radius vs Straight Taper Brass
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