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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy due to velocity, charge, or random...?
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<blockquote data-quote="entoptics" data-source="post: 1589598" data-attributes="member: 104268"><p><span style="font-size: 14px">I use a LabRadar.</span></p><p><span style="font-size: 14px">I weight sort, neck turn, hand weigh charges, and have runout at 0.002" or less.</span></p><p></p><p>I do not have the money for much more than I run, but I have a torque wrench and know how to use it. My 300 WM does have a Shilen barrel installed, but is otherwise stock. I do have good optics and mounts. The rifle shoots more or less everything I feed it into 0.8 - 1.2 MOA. Those numbers are long term averages of 4 shot groups using half dozen 200 gr class projectile types (Best = 208 ELDM, worst = 212 ELDX. Berger, Accubond, and Sierra GK in the middle). There is no "if I do my part" or "this rifle is capable of" in my spreadsheet. What the calipers get is what is recorded.</p><p><span style="font-size: 14px"></span></p><p><span style="font-size: 14px">I am above average, but nowhere near exceptional. Almost all shooting is </span>done prone, bipod, rear bag. I have not seen measurably different group sizes in the few times a year I shoot from a concrete bench.</p><p><span style="font-size: 14px"></span></p><p><span style="font-size: 14px">Here are the results of a years worth of measured groups from 100-500 yds. All 208 ELDM, Fed 210M, H1000 with no more </span>than<span style="font-size: 14px"> ±0.75 gr changes in charge weight. They were not all intended as seating depth tests of course, but that is information that I record for every measured group. I did not include groups from days with poor weather or other confounding conditions (e.g. hunting practice in the wind).</span></p><p><span style="font-size: 14px">[ATTACH=full]125417[/ATTACH] </span></p><p><span style="font-size: 14px"></span></p><p>Here's two recent tests I did. Velocities from LabRadar, and a target at 400 yds. There were no "nodes" in accuracy/drop, and as you can see, not much in the velocities either. I revisited the lower flattish area on the ELDX and got different results (the upper one was too hot for my taste). Unfortunately, I stupidly saved over my spreadsheet and lost the rest of the ELDM data and the revisited ELDX test. There was no identifiable node for the ELDM either, from 77.8 down to 75.1, but you'll have to take my word for it.</p><p><span style="font-size: 14px">[ATTACH=full]125418[/ATTACH] </span></p><p></p><p>As mentioned, I have some experience with this. I do not deny that some folks see "nodes". I have not. I have also thoroughly proven to myself that it's unnecessary for my purposes. I still do it, simply because I'm a scientist, and enjoy applying that to my hobby. Many people forget that a null result is often just as important as a positive result.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1589598, member: 104268"] [SIZE=14px]I use a LabRadar. I weight sort, neck turn, hand weigh charges, and have runout at 0.002" or less.[/SIZE] I do not have the money for much more than I run, but I have a torque wrench and know how to use it. My 300 WM does have a Shilen barrel installed, but is otherwise stock. I do have good optics and mounts. The rifle shoots more or less everything I feed it into 0.8 - 1.2 MOA. Those numbers are long term averages of 4 shot groups using half dozen 200 gr class projectile types (Best = 208 ELDM, worst = 212 ELDX. Berger, Accubond, and Sierra GK in the middle). There is no "if I do my part" or "this rifle is capable of" in my spreadsheet. What the calipers get is what is recorded. [SIZE=14px] I am above average, but nowhere near exceptional. Almost all shooting is [/SIZE]done prone, bipod, rear bag. I have not seen measurably different group sizes in the few times a year I shoot from a concrete bench. [SIZE=14px] Here are the results of a years worth of measured groups from 100-500 yds. All 208 ELDM, Fed 210M, H1000 with no more [/SIZE]than[SIZE=14px] ±0.75 gr changes in charge weight. They were not all intended as seating depth tests of course, but that is information that I record for every measured group. I did not include groups from days with poor weather or other confounding conditions (e.g. hunting practice in the wind). [ATTACH=full]125417[/ATTACH] [/SIZE] Here's two recent tests I did. Velocities from LabRadar, and a target at 400 yds. There were no "nodes" in accuracy/drop, and as you can see, not much in the velocities either. I revisited the lower flattish area on the ELDX and got different results (the upper one was too hot for my taste). Unfortunately, I stupidly saved over my spreadsheet and lost the rest of the ELDM data and the revisited ELDX test. There was no identifiable node for the ELDM either, from 77.8 down to 75.1, but you'll have to take my word for it. [SIZE=14px][ATTACH=full]125418[/ATTACH] [/SIZE] As mentioned, I have some experience with this. I do not deny that some folks see "nodes". I have not. I have also thoroughly proven to myself that it's unnecessary for my purposes. I still do it, simply because I'm a scientist, and enjoy applying that to my hobby. Many people forget that a null result is often just as important as a positive result. [/QUOTE]
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Accuracy due to velocity, charge, or random...?
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