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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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<blockquote data-quote="MagnumManiac" data-source="post: 555902" data-attributes="member: 10755"><p>Unfortunately, internal ballistics is not an exact science, and yes changes in temperature can and do affect velocities and pressure.</p><p>Generally, the higher the temp, the higher the pressure and therefore velocity, but it has been known that very cool temps can also increase pressure. </p><p>Atmospheric conditions have little affect on internal ballistics, there is some, but almost non measurable. External ballistics is another story.</p><p>Barrel heat could also be a factor, so keep this in mind when developing a load.</p><p></p><p>What is more likely, is that the light on the day was different from the previous session, and this is what changed the reading on your chrony. This is very common.</p><p>I have the same chrony as you, and I always use the diffusers, no matter if it's cloudy, sunny or bits of both.</p><p></p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 555902, member: 10755"] Unfortunately, internal ballistics is not an exact science, and yes changes in temperature can and do affect velocities and pressure. Generally, the higher the temp, the higher the pressure and therefore velocity, but it has been known that very cool temps can also increase pressure. Atmospheric conditions have little affect on internal ballistics, there is some, but almost non measurable. External ballistics is another story. Barrel heat could also be a factor, so keep this in mind when developing a load. What is more likely, is that the light on the day was different from the previous session, and this is what changed the reading on your chrony. This is very common. I have the same chrony as you, and I always use the diffusers, no matter if it's cloudy, sunny or bits of both. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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