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Long Range Hunting & Shooting
300 Holland & Holland ...anybody played with this one ?
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<blockquote data-quote="mmacfive" data-source="post: 1795057" data-attributes="member: 93205"><p>I'm quite sure I'm alone on an island here but I'll give you some of the reasons I don't believe that case design has an effect on velocity:</p><p></p><p></p><p>The amount of energy in any given powder and charge weight is fixed. It's how we harness the energy that will affect the velocity. If all things are equal 80grs of H1000 in a 280 nosler will give the same results as 80grs of H1000 in a 7mm STW. </p><p></p><p></p><p>Velocity will be determined from the pressure curve, i.e. the "area under the curve" will determine the final velocity. The area under the curve can be manipulated in many ways. e.g. powder, primer, freebore, headspace, dimensions, etc. it's not the peak pressure that matters it's how long we can hold that peak pressure. </p><p></p><p></p><p>The case is not the total combustion chamber. Most rifles hit their peak pressure when the bullet is around 3" into the bore. Depending on caliber this can have a huge effect on the combustion chamber volume thereby minimizing the actual case design. </p><p></p><p></p><p>Then there is that physics thing: PV=nRT or the ideal has constant. Or P= nRT/V. Which says that volume of any shape has the same effect on pressure. </p><p></p><p></p><p>I really like it when new cartridges are introduced. An example is the 6.5 PRC. The 6.5 PRC has nearly identical case capacity as my 6.5-06 or the 6.5 RM. I now have access to a whole bunch of modern reloading data for my 6.5-06 with new powders that make it seem like a new gun. </p><p></p><p></p><p>I am not saying a steep shoulder case design doesn't have benefits like head space, brass growth, etc but I don't think velocity (or "efficiency") is one of them.</p></blockquote><p></p>
[QUOTE="mmacfive, post: 1795057, member: 93205"] I’m quite sure I’m alone on an island here but I’ll give you some of the reasons I don’t believe that case design has an effect on velocity: The amount of energy in any given powder and charge weight is fixed. It’s how we harness the energy that will affect the velocity. If all things are equal 80grs of H1000 in a 280 nosler will give the same results as 80grs of H1000 in a 7mm STW. Velocity will be determined from the pressure curve, i.e. the “area under the curve” will determine the final velocity. The area under the curve can be manipulated in many ways. e.g. powder, primer, freebore, headspace, dimensions, etc. it’s not the peak pressure that matters it’s how long we can hold that peak pressure. The case is not the total combustion chamber. Most rifles hit their peak pressure when the bullet is around 3” into the bore. Depending on caliber this can have a huge effect on the combustion chamber volume thereby minimizing the actual case design. Then there is that physics thing: PV=nRT or the ideal has constant. Or P= nRT/V. Which says that volume of any shape has the same effect on pressure. I really like it when new cartridges are introduced. An example is the 6.5 PRC. The 6.5 PRC has nearly identical case capacity as my 6.5-06 or the 6.5 RM. I now have access to a whole bunch of modern reloading data for my 6.5-06 with new powders that make it seem like a new gun. I am not saying a steep shoulder case design doesn’t have benefits like head space, brass growth, etc but I don’t think velocity (or “efficiency”) is one of them. [/QUOTE]
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300 Holland & Holland ...anybody played with this one ?
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