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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet BC
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<blockquote data-quote="GBA1776" data-source="post: 321245" data-attributes="member: 20522"><p>a tip all published ballistic coefficient figures are published by the manufacturer using the g1 model for drag so the best way to get an accurate estimate is to measure, a sample 15 or so of the ammo you usually use then find a ballistic coefficient calculator,input the measurements and there you go.</p><p> </p><p>i am currently putting together a chart for .22 wmr ammo i have measured about 5 different brands of ammo but i currently cant afford to buy every brand so i dont know when it will be done.</p><p> </p><p>if i could enlist some of your guys help. </p><p>i have measured CCI 30gr vmax poly tip </p><p>CCI 40gr Hollowpoint </p><p>and fiocchi 40gr jacketed soft hollowpoint</p><p>but i hav'nt really bought other brands </p><p>if anyone has a micrometer and .22 mag ammo of a different brand or grain </p><p>i could use the measurements all i need is the </p><p> </p><p>1 the leangth of the curved section of the bullet basically where the cartridge meets the brass to the tip </p><p> </p><p>2 the diameter of the tip measure the flat surface of the tip. and measure more than one preferably 15- or 20 because they all will probably deviate about .010 on all of the measurements just because thats mass production </p><p> </p><p>please only send me measurements from a digital caliper because the dial ones usually dont have an increment smaller than .050-.1"</p><p> </p><p>if you dont have a caliper and have some ammo and are feeling nice and would like to send me a few i would really appreciate it. PM me with anything you have for me</p></blockquote><p></p>
[QUOTE="GBA1776, post: 321245, member: 20522"] a tip all published ballistic coefficient figures are published by the manufacturer using the g1 model for drag so the best way to get an accurate estimate is to measure, a sample 15 or so of the ammo you usually use then find a ballistic coefficient calculator,input the measurements and there you go. i am currently putting together a chart for .22 wmr ammo i have measured about 5 different brands of ammo but i currently cant afford to buy every brand so i dont know when it will be done. if i could enlist some of your guys help. i have measured CCI 30gr vmax poly tip CCI 40gr Hollowpoint and fiocchi 40gr jacketed soft hollowpoint but i hav'nt really bought other brands if anyone has a micrometer and .22 mag ammo of a different brand or grain i could use the measurements all i need is the 1 the leangth of the curved section of the bullet basically where the cartridge meets the brass to the tip 2 the diameter of the tip measure the flat surface of the tip. and measure more than one preferably 15- or 20 because they all will probably deviate about .010 on all of the measurements just because thats mass production please only send me measurements from a digital caliper because the dial ones usually dont have an increment smaller than .050-.1" if you dont have a caliper and have some ammo and are feeling nice and would like to send me a few i would really appreciate it. PM me with anything you have for me [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bullet BC
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