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Hunting
Long Range Hunting & Shooting
Powder temp and case insulation?
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<blockquote data-quote="Timber338" data-source="post: 1188555" data-attributes="member: 33822"><p>There are so many variables that go into temperature sensitivity. Of course the powders are proven to burn hotter/faster when they start out at a warmer temperature, and there are some established ranges of temperature sensitivity for each powder.</p><p></p><p>How large are the temperature swings when you are shooting? How are you measuring your muzzle velocity?</p><p></p><p>My motivation is first cold bore shot accuracy/velocity, so I go to great lengths to make sure my entire system is at the same ambient temperature on any given test so there are no variations. And then of course repeat the tests on different days that have warmer/colder ambient temperatures.</p><p></p><p>Based on my experience, I am very careful to shoot first thing in the morning, with the rifle and ammo being left outside all night. For the first hour or so of light, right as the sun is rising, I get a very consistent temperature window. I know everything is at the same temperature. And that is when I record a few shots in a row. Just like I would hunt with. So the whole point is, with the ammo just sitting in the air, I think the powder in the case will have some lag with the changing outside air temperature.</p><p></p><p>But just like Schnyd said, a cartridge in a warm bore, touching the chamber walls, can transfer heat to the powder very quickly. </p><p></p><p>So I think it could depend on your application for whether or not the powder inside the cartridge heats quickly. I think that bench rest shooters have an entirely different set of challenges than a hunter does. As long as you test appropriately, you should be able to characterize your rifle, because if your muzzle velocity is changing, your point of impact at long range will change accordingly.</p></blockquote><p></p>
[QUOTE="Timber338, post: 1188555, member: 33822"] There are so many variables that go into temperature sensitivity. Of course the powders are proven to burn hotter/faster when they start out at a warmer temperature, and there are some established ranges of temperature sensitivity for each powder. How large are the temperature swings when you are shooting? How are you measuring your muzzle velocity? My motivation is first cold bore shot accuracy/velocity, so I go to great lengths to make sure my entire system is at the same ambient temperature on any given test so there are no variations. And then of course repeat the tests on different days that have warmer/colder ambient temperatures. Based on my experience, I am very careful to shoot first thing in the morning, with the rifle and ammo being left outside all night. For the first hour or so of light, right as the sun is rising, I get a very consistent temperature window. I know everything is at the same temperature. And that is when I record a few shots in a row. Just like I would hunt with. So the whole point is, with the ammo just sitting in the air, I think the powder in the case will have some lag with the changing outside air temperature. But just like Schnyd said, a cartridge in a warm bore, touching the chamber walls, can transfer heat to the powder very quickly. So I think it could depend on your application for whether or not the powder inside the cartridge heats quickly. I think that bench rest shooters have an entirely different set of challenges than a hunter does. As long as you test appropriately, you should be able to characterize your rifle, because if your muzzle velocity is changing, your point of impact at long range will change accordingly. [/QUOTE]
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Powder temp and case insulation?
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