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Rifles, Reloading, Optics, Equipment
Reloading
Bullet speeds.
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<blockquote data-quote="del2les" data-source="post: 1951274" data-attributes="member: 9299"><p>Simple answer: YES. But their are many reasons why this is. Bearing surface, jacket thickness, bullet profile, jacket smoothness, core hardness, actual bullet diameter (i.e .3085 vs .3079), jacket material and friction ratio, etc. In many handguns, hard cast lead bullets can be driven faster than jacketed.</p><p></p><p>Decades ago, we conducted a very informal test with a few of our firearms, and we found variations of +/- 100 fps or so with some bullets/calibers just by changing bullet manufacture and styles. Then after we chrono'd a few loads, we took the same bullets and using 000/0000 steel wool, we horizontally polished/abraded a few bullets and loaded. What we we found was interesting. We suspected the light abrasions would reduce the velocity, and on some bullets/loads, it did slightly, but on a couple of bullet/loads, the vels actually went up. Not by much, but it was recordable on the chrono averages.</p><p></p><p>As a bullet swager, I have played with varied design changes that produced higher or lesser vels for the same weight of bullets. Biggest factors I found were bearing surface and jacket material/smoothness. Brass jacketed bullets vs guilding or copper of the same style/weight gave increased vels due to the higher zinc content in the brass with a lower friction ratio.</p><p></p><p>To reduce bore friction and help vels, through the decades, manufactures have used various coatings with varied success.</p></blockquote><p></p>
[QUOTE="del2les, post: 1951274, member: 9299"] Simple answer: YES. But their are many reasons why this is. Bearing surface, jacket thickness, bullet profile, jacket smoothness, core hardness, actual bullet diameter (i.e .3085 vs .3079), jacket material and friction ratio, etc. In many handguns, hard cast lead bullets can be driven faster than jacketed. Decades ago, we conducted a very informal test with a few of our firearms, and we found variations of +/- 100 fps or so with some bullets/calibers just by changing bullet manufacture and styles. Then after we chrono'd a few loads, we took the same bullets and using 000/0000 steel wool, we horizontally polished/abraded a few bullets and loaded. What we we found was interesting. We suspected the light abrasions would reduce the velocity, and on some bullets/loads, it did slightly, but on a couple of bullet/loads, the vels actually went up. Not by much, but it was recordable on the chrono averages. As a bullet swager, I have played with varied design changes that produced higher or lesser vels for the same weight of bullets. Biggest factors I found were bearing surface and jacket material/smoothness. Brass jacketed bullets vs guilding or copper of the same style/weight gave increased vels due to the higher zinc content in the brass with a lower friction ratio. To reduce bore friction and help vels, through the decades, manufactures have used various coatings with varied success. [/QUOTE]
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