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Rifles, Reloading, Optics, Equipment
Reloading
ADG 300wm Brass Case volume question
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<blockquote data-quote="wildcat455" data-source="post: 1615730" data-attributes="member: 102653"><p>OP:</p><p>Here's another thing you can try. I don't know how well it works across manufacturers, because I've never used it for that, but I know it works ok for brass of the same manufacturer to get you close to the same velocity in different case weights. </p><p></p><p>It involves a bit of simple math. I'll type out the equation and then give an example. </p><p></p><p>(W1-W2)/15=C</p><p></p><p>Not sure if I expressed that equation right, I'm no mathematician. Here it is broken down into something I can understand:</p><p>W1-W2=D</p><p>D/15=C</p><p></p><p>W1 is case weight you have a load for already.</p><p> W2 is new case weight you want to adjust the load to.</p><p>D is Difference (+ or - number depending on if you are going to be increasing the load, or decreasing it)</p><p>C is change in grains (+ or - number depending on if you are going to be increasing the load, or decreasing it). </p><p></p><p>This will only be an approximation, and it's up to you if you want to round up or down to closest 1/10th of a grain.</p><p></p><p>So here's the examples. </p><p>I have a load worked up with a charge weight of 74 grains, in a case that weighs 250 grains. The case that I want to use weighs 240 grains. </p><p></p><p>W1-W2= D or 250-240=10</p><p></p><p>D/15=C or 10/15= .6666</p><p></p><p>.6 grains is what I'll be adding to my original load number, because it is a positive number. </p><p></p><p>Conversely, If the case I was using with my 74 gr charge weight weighed less than the case I was moving the load to using the same numbers as in the original example, it would look like this:</p><p> W1-W2=D or 240-250= -10</p><p>-10=D</p><p>D/15=C or -10/15= -.6666</p><p></p><p>I would be reducing my load by .6 grains in the new case. </p><p></p><p>The proof in the pudding is to velocity check the new load with the new case, and make any adjustments from there to get back to your target velocity. </p><p></p><p>Clear as mud, right? LOL!</p></blockquote><p></p>
[QUOTE="wildcat455, post: 1615730, member: 102653"] OP: Here’s another thing you can try. I don’t know how well it works across manufacturers, because I’ve never used it for that, but I know it works ok for brass of the same manufacturer to get you close to the same velocity in different case weights. It involves a bit of simple math. I’ll type out the equation and then give an example. (W1-W2)/15=C Not sure if I expressed that equation right, I’m no mathematician. Here it is broken down into something I can understand: W1-W2=D D/15=C W1 is case weight you have a load for already. W2 is new case weight you want to adjust the load to. D is Difference (+ or - number depending on if you are going to be increasing the load, or decreasing it) C is change in grains (+ or - number depending on if you are going to be increasing the load, or decreasing it). This will only be an approximation, and it’s up to you if you want to round up or down to closest 1/10th of a grain. So here’s the examples. I have a load worked up with a charge weight of 74 grains, in a case that weighs 250 grains. The case that I want to use weighs 240 grains. W1-W2= D or 250-240=10 D/15=C or 10/15= .6666 .6 grains is what I’ll be adding to my original load number, because it is a positive number. Conversely, If the case I was using with my 74 gr charge weight weighed less than the case I was moving the load to using the same numbers as in the original example, it would look like this: W1-W2=D or 240-250= -10 -10=D D/15=C or -10/15= -.6666 I would be reducing my load by .6 grains in the new case. The proof in the pudding is to velocity check the new load with the new case, and make any adjustments from there to get back to your target velocity. Clear as mud, right? LOL! [/QUOTE]
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ADG 300wm Brass Case volume question
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