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Rifles, Reloading, Optics, Equipment
Reloading
temp stability of powder
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<blockquote data-quote="coyotezapper" data-source="post: 409641" data-attributes="member: 20438"><p>I freeze loaded cartridges overnight in a 0 degree freezer. I then transfer them to the range in a cooler( also frozen ) packed with Rubbermaid Blue Ice. Do they warm a little? Maybe but very little. I then shoot the frozen rounds first, usually two 3 shot groups at a time. I pull them from the cooler one at a time. I shoot these fast as not to have the rounds heat up in the chamber or as little as possible. I am shooting for data not groups. I let the barrel completely cool then repeat until I feel I am getting good data to analyze. This is usually 15-18 rounds. I then let barrel cool again, clean bore and then start with rounds that are not frozen and follow the same process. The outside temperature for these tests vary but I try to do it in the 80-90 degree range. Any warmer does not make any sense since I don't hunt big game in 80 degree plus weather. I work with a high and low only and average from there. Varmint rounds are all developed/finalized in 90+ degree weather since it is what temps I wiould be shooting in. From High to low I lose anywhere from 20 to 55 fps. depending on the load with Extreme powders. Yes 55 is a lot at longer ranges but I have seen 150-200 fps. differences with non Extreme powders. The only exception is a .243 Win load with H4895 and 55 grain BT that had a variation of 240 fps. I still have not figured out that one. I ALWAYS look to try and find a fault with a load. For example, if I shoot a real good group with a certain recipe in testing I will test that one recipe extensively before calling it good. I look for something bad. This process works for me. I have used it in everything from 17 fireball to 35 Whelen. I use it with all powders because Extreme powders are not always the most accurate but I try the Extreme first. With some powders I have a warm weather and a cold weather load. Is this an absolute scientific test? No, as there would need to be multiple barrels/twists/lengths/primers and even brass combinations that would need to be tested, plus even maybe freezing the rifle to make all things equal. But it works for me.</p></blockquote><p></p>
[QUOTE="coyotezapper, post: 409641, member: 20438"] I freeze loaded cartridges overnight in a 0 degree freezer. I then transfer them to the range in a cooler( also frozen ) packed with Rubbermaid Blue Ice. Do they warm a little? Maybe but very little. I then shoot the frozen rounds first, usually two 3 shot groups at a time. I pull them from the cooler one at a time. I shoot these fast as not to have the rounds heat up in the chamber or as little as possible. I am shooting for data not groups. I let the barrel completely cool then repeat until I feel I am getting good data to analyze. This is usually 15-18 rounds. I then let barrel cool again, clean bore and then start with rounds that are not frozen and follow the same process. The outside temperature for these tests vary but I try to do it in the 80-90 degree range. Any warmer does not make any sense since I don't hunt big game in 80 degree plus weather. I work with a high and low only and average from there. Varmint rounds are all developed/finalized in 90+ degree weather since it is what temps I wiould be shooting in. From High to low I lose anywhere from 20 to 55 fps. depending on the load with Extreme powders. Yes 55 is a lot at longer ranges but I have seen 150-200 fps. differences with non Extreme powders. The only exception is a .243 Win load with H4895 and 55 grain BT that had a variation of 240 fps. I still have not figured out that one. I ALWAYS look to try and find a fault with a load. For example, if I shoot a real good group with a certain recipe in testing I will test that one recipe extensively before calling it good. I look for something bad. This process works for me. I have used it in everything from 17 fireball to 35 Whelen. I use it with all powders because Extreme powders are not always the most accurate but I try the Extreme first. With some powders I have a warm weather and a cold weather load. Is this an absolute scientific test? No, as there would need to be multiple barrels/twists/lengths/primers and even brass combinations that would need to be tested, plus even maybe freezing the rifle to make all things equal. But it works for me. [/QUOTE]
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Reloading
temp stability of powder
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