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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
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<blockquote data-quote="Richard338" data-source="post: 67707" data-attributes="member: 1537"><p>Yes, the numbers should be 3,4 and 5.</p><p>Dan Lilja's site has a downloadable Excel sheet that lets you play with bullet design parameters. You can put extreme ogives on, but then you will see that there is no bearing surface left. If you make it longer, you will see that the required twist changes. I believe it uses McCoy's code to compute stability. The code computes G1 BCs that are usually accurate to within about 2%. You can specify the density to reflect solid brass, or jacketed lead. Also of interest is changing meplat diameter. For a fixed length, a zero meplat is not optimal for BC. Of course when you trim meplats you change the length, so you should adjust the length in the calc.</p></blockquote><p></p>
[QUOTE="Richard338, post: 67707, member: 1537"] Yes, the numbers should be 3,4 and 5. Dan Lilja's site has a downloadable Excel sheet that lets you play with bullet design parameters. You can put extreme ogives on, but then you will see that there is no bearing surface left. If you make it longer, you will see that the required twist changes. I believe it uses McCoy's code to compute stability. The code computes G1 BCs that are usually accurate to within about 2%. You can specify the density to reflect solid brass, or jacketed lead. Also of interest is changing meplat diameter. For a fixed length, a zero meplat is not optimal for BC. Of course when you trim meplats you change the length, so you should adjust the length in the calc. [/QUOTE]
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