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Rifles, Reloading, Optics, Equipment
Reloading
What is an acceptable change in velocity with a change in temp
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<blockquote data-quote="Mikecr" data-source="post: 681244" data-attributes="member: 1521"><p>I don't know if there is anything you can really do about it.</p><p>Not only does powder/primer temp influence results, but so does barrel/bore dimensions.</p><p>There may also be contribution of differing lighting to your chrono screens.</p><p></p><p>What I do to reduce the issue is pull every shot from a pants pocket. This, while load developing and when in the field, regardless of temps summer or winter. But I can imagine this would not be practical with 300RUM..</p><p>My thinking is, rather than trying to cool ammo, which is logistically difficult and causes condensation below dew point, I can keep it near body temp pretty much all year long.</p><p>I'll pull it out of my arse if I have to(but not with 300RUM).</p><p></p><p>I'm working on a temp controlled/heated ammo box for the bench, that single shot dispenses(that's the tricky part). A better design would allow practical use in the field as well(tricky part II). If I develop something of value, I'll bring it here for all to benefit.</p><p>R&D...........</p></blockquote><p></p>
[QUOTE="Mikecr, post: 681244, member: 1521"] I don't know if there is anything you can really do about it. Not only does powder/primer temp influence results, but so does barrel/bore dimensions. There may also be contribution of differing lighting to your chrono screens. What I do to reduce the issue is pull every shot from a pants pocket. This, while load developing and when in the field, regardless of temps summer or winter. But I can imagine this would not be practical with 300RUM.. My thinking is, rather than trying to cool ammo, which is logistically difficult and causes condensation below dew point, I can keep it near body temp pretty much all year long. I'll pull it out of my arse if I have to(but not with 300RUM). I'm working on a temp controlled/heated ammo box for the bench, that single shot dispenses(that's the tricky part). A better design would allow practical use in the field as well(tricky part II). If I develop something of value, I'll bring it here for all to benefit. R&D........... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What is an acceptable change in velocity with a change in temp
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