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Rifles, Reloading, Optics, Equipment
Reloading
Hidden Pressure Reading: A Method
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<blockquote data-quote="MagnumManiac" data-source="post: 2875400" data-attributes="member: 10755"><p>I have to clear something up here, actions are built to withstand 3 or 4 times the amount of chamber pressure, some, like the Weatherby Mark V, are even stronger than this. The nominal rate of destruction is in excess of 200,000psi for CM actions or above, and a little less for SS actions of 416 material, this varies of course.</p><p>Now, actions are built to be used for myriad of cartridges, therefore the reason behind having a yield strength of 200,000psi or more.</p><p>Another factor regarding pressure in a cartridge is this, if webs are thin, such as Norma brass, primer pockets will expand far sooner and easier than cases with thick webs, like Winchester older brass and Lapua. There is no way around this.</p><p>When I tested cases to blown primers over the Pressure Trace, Norma was the lowest, then Federal, then Hornady, then Bonanza (which I think are Hornady), then S&B, then Remington, then Winchester and Lapua, all with LR primers, those same cases were tested with SR primers (those available) and the results were flabbergasting, a SR primed case will take half again more pressure before primers blow and the pocket deforms, which is why I switched to SR primers in every case that had the option up to 308. Now, when you take a .473" case head, replace a .210" hole with a .175" and you have far more surface area for the pressure to expand…which is a very good thing.</p><p>The same is true with .375" case heads, but they are smaller anyway.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2875400, member: 10755"] I have to clear something up here, actions are built to withstand 3 or 4 times the amount of chamber pressure, some, like the Weatherby Mark V, are even stronger than this. The nominal rate of destruction is in excess of 200,000psi for CM actions or above, and a little less for SS actions of 416 material, this varies of course. Now, actions are built to be used for myriad of cartridges, therefore the reason behind having a yield strength of 200,000psi or more. Another factor regarding pressure in a cartridge is this, if webs are thin, such as Norma brass, primer pockets will expand far sooner and easier than cases with thick webs, like Winchester older brass and Lapua. There is no way around this. When I tested cases to blown primers over the Pressure Trace, Norma was the lowest, then Federal, then Hornady, then Bonanza (which I think are Hornady), then S&B, then Remington, then Winchester and Lapua, all with LR primers, those same cases were tested with SR primers (those available) and the results were flabbergasting, a SR primed case will take half again more pressure before primers blow and the pocket deforms, which is why I switched to SR primers in every case that had the option up to 308. Now, when you take a .473” case head, replace a .210” hole with a .175” and you have far more surface area for the pressure to expand…which is a very good thing. The same is true with .375” case heads, but they are smaller anyway. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Hidden Pressure Reading: A Method
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