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Rifles, Reloading, Optics, Equipment
Reloading
Help with velocity variance
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<blockquote data-quote="Striker77s" data-source="post: 454236" data-attributes="member: 28584"><p>I am new to reloading so I fully admit I have a lot to learn. That is why I'm trying to test and take a systematic approach. So much of what is said in these forums are based off of gut feelings from personal experience. I would be wise to listen to such experience since I'm so green, but occasionally such gut feelings are wrong. I'm a scientist so I admit I have a bias towards controlled systematic experiments. </p><p></p><p>When I did my last test a large snow storm was coming and I was in a hurry to shoot and get out of there. So I didn't have the luxury of time to really spend time on my experiment. From my background in physics it seems to me that Boss Hoss is right in regards to velocity, it does matter. Almost everything we do as reloaders is to produce consistent bullet velocity. All the ballistic calculations are based on physics to predict the behavior of the bullet. The behavior of the bullet depends upon many environmental factors (wind, outside temperature, humidity, etc), angle, bullet design, and velocity. Outside of having a quality firearm (barrel, bedding etc) the factor we try to control as reloaders is velocity. Annealing, brass volume, brass strength, brass shape, primers, powders, flash hole consistency, cleaning, cartridge temperature, etc all lead to better consistent velocity. I'm sure there are a few but the only factor I can think of the effects the bullet flight beyond velocity that reloaders mess with is meplat trimming. If having more consistent velocity doesn't lead to better groups it isn't because velocity doesn't matter it is because others factors are causing problems that mask the velocity improvement, such a barrel wear, barrel harmonics, bullet design etc. </p><p></p><p>I have looked for data on how each one of these reloading techniques effect the velocity in relation to each other but I can't find it. For example a list in order of impact on velocity of each reloading factor, reloaders could decide which factors to worry about first. As a shooter gets more serious they can start worrying about the minor techniques. Right now as I read and ask for answers I always get conflicting responses, some saying US cleaning of the interior of the brass matters and other saying it doesn't, some saying a low velocity SD matters and others say it doesn't. I'm sure they all matter to some degree the question is how much. Which factor are the most important in relation to others. I bet a few of the more experienced reloaders could come up with a reasonable list and I would love to see. But what I really want to see is a controlled experiment where each factor is tested and rated on how much it impacts the velocity. From there shooters can use ballistic software to see if at the distance they are shooting to if it is worth it to deal with. </p><p></p><p>Now in the end I wish to state again that I'm green and inexperienced. All of what I said may be a bunch of garbage and way off. I do sincerely value and appreciate those who have taken the time to respond. I read each post carefully and compare it with other posts to decide what action to take next. </p><p></p><p>Thanks again for all the generous help given. For example those who pointed out the fact that I need to put my chrony even farther away and that my car heater attempt to heat up the cartridge was flawed is very helpful. I will try to correct it the next time I do it. </p><p></p><p>Thanks,</p><p>Mark</p></blockquote><p></p>
[QUOTE="Striker77s, post: 454236, member: 28584"] I am new to reloading so I fully admit I have a lot to learn. That is why I'm trying to test and take a systematic approach. So much of what is said in these forums are based off of gut feelings from personal experience. I would be wise to listen to such experience since I'm so green, but occasionally such gut feelings are wrong. I'm a scientist so I admit I have a bias towards controlled systematic experiments. When I did my last test a large snow storm was coming and I was in a hurry to shoot and get out of there. So I didn't have the luxury of time to really spend time on my experiment. From my background in physics it seems to me that Boss Hoss is right in regards to velocity, it does matter. Almost everything we do as reloaders is to produce consistent bullet velocity. All the ballistic calculations are based on physics to predict the behavior of the bullet. The behavior of the bullet depends upon many environmental factors (wind, outside temperature, humidity, etc), angle, bullet design, and velocity. Outside of having a quality firearm (barrel, bedding etc) the factor we try to control as reloaders is velocity. Annealing, brass volume, brass strength, brass shape, primers, powders, flash hole consistency, cleaning, cartridge temperature, etc all lead to better consistent velocity. I'm sure there are a few but the only factor I can think of the effects the bullet flight beyond velocity that reloaders mess with is meplat trimming. If having more consistent velocity doesn't lead to better groups it isn't because velocity doesn't matter it is because others factors are causing problems that mask the velocity improvement, such a barrel wear, barrel harmonics, bullet design etc. I have looked for data on how each one of these reloading techniques effect the velocity in relation to each other but I can't find it. For example a list in order of impact on velocity of each reloading factor, reloaders could decide which factors to worry about first. As a shooter gets more serious they can start worrying about the minor techniques. Right now as I read and ask for answers I always get conflicting responses, some saying US cleaning of the interior of the brass matters and other saying it doesn't, some saying a low velocity SD matters and others say it doesn't. I'm sure they all matter to some degree the question is how much. Which factor are the most important in relation to others. I bet a few of the more experienced reloaders could come up with a reasonable list and I would love to see. But what I really want to see is a controlled experiment where each factor is tested and rated on how much it impacts the velocity. From there shooters can use ballistic software to see if at the distance they are shooting to if it is worth it to deal with. Now in the end I wish to state again that I'm green and inexperienced. All of what I said may be a bunch of garbage and way off. I do sincerely value and appreciate those who have taken the time to respond. I read each post carefully and compare it with other posts to decide what action to take next. Thanks again for all the generous help given. For example those who pointed out the fact that I need to put my chrony even farther away and that my car heater attempt to heat up the cartridge was flawed is very helpful. I will try to correct it the next time I do it. Thanks, Mark [/QUOTE]
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Help with velocity variance
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