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Rifles, Reloading, Optics, Equipment
Reloading
Norma MRP temp sensitivity test
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<blockquote data-quote="Marine sniper" data-source="post: 1105149" data-attributes="member: 4768"><p>Not saying your results are inaccurate: but to how much trouble did you go through to ensure your baselines are accurate?</p><p></p><p>For example: </p><p></p><p>When I do testing like you did I will set up my chronograph the day I am going to test / expose the rifle and ammo to the temps to be tested in long enough to take effect / level the rifle barrel and chronograph, etc. I want EVERYTHING except the temperature to be as consistent as possible.</p><p></p><p>It is usually pretty easy to get at least 20+ degree temp swings in a day. I will set everything up and shoot early in the morning; then come back later in the day to test further. For the later in the day shooting I will leave the rifle and ammo somewhere where temps are representative to the testing I am trying to do. When I am at my ranch in Idaho I can leave the chronograph and bench set up and simply put the rifle back on the bench and shoot at the exact same target I had shot at earlier.</p><p></p><p>Some guys don't take into account (particularly with closely spaced together skysceens) how much a slight degree of change in chronograph set up can effect apparent velocities.</p><p></p><p>As a source of additional data this type of testing is usually done at 1000 yards- then I can track chronograph data and actual bullet impacts. After gathering all the data you can get a true representation (1* = X MOA)</p></blockquote><p></p>
[QUOTE="Marine sniper, post: 1105149, member: 4768"] Not saying your results are inaccurate: but to how much trouble did you go through to ensure your baselines are accurate? For example: When I do testing like you did I will set up my chronograph the day I am going to test / expose the rifle and ammo to the temps to be tested in long enough to take effect / level the rifle barrel and chronograph, etc. I want EVERYTHING except the temperature to be as consistent as possible. It is usually pretty easy to get at least 20+ degree temp swings in a day. I will set everything up and shoot early in the morning; then come back later in the day to test further. For the later in the day shooting I will leave the rifle and ammo somewhere where temps are representative to the testing I am trying to do. When I am at my ranch in Idaho I can leave the chronograph and bench set up and simply put the rifle back on the bench and shoot at the exact same target I had shot at earlier. Some guys don't take into account (particularly with closely spaced together skysceens) how much a slight degree of change in chronograph set up can effect apparent velocities. As a source of additional data this type of testing is usually done at 1000 yards- then I can track chronograph data and actual bullet impacts. After gathering all the data you can get a true representation (1* = X MOA) [/QUOTE]
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Norma MRP temp sensitivity test
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