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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5,000 fps coyote rifle?
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<blockquote data-quote="J E Custom" data-source="post: 1761167" data-attributes="member: 2736"><p>There is another issue when trying to go that fast. The bullets themselves have a problem with jackets and balance at High rotational/RPM speeds.</p><p></p><p>I did an experiment with high velocity .224 diameter cartridges and this is what I found.</p><p></p><p>I improved a 223 WSSM and was able to get 4300 to 4400 ft/sec without to many problems. As I up the velocity, I started destroying different brands and stiles of bullets. Accuracy went out the window and at close range the target would be riddled with holes after only one shot. Instability was one of the things I discovered and jacket loss was common with some bullets starting around 4300 ft/sec. I then switch to Mono metal bullets and found the centrifugal balance caused poor accuracy at the velocity I was trying to reach.</p><p></p><p>I even slowed down the twist rate to 1 in 16'' and found that this helped save some bullets. I managed to exceed 4650 without pressure signs, but found only a couple of jacketed bullets that could handle the stress of that speed and still be accurate. I even machined some solid bullets without the hollow points, (I also discovered that with high rotational forces the hollow points would actually open up enough to effect accuracy.</p><p></p><p>Like everything else, there seems to be a limit to what you can do with the lightweight 22 cal bullets. My fastest accuracy load for the little WSSM ended up at 4628 ft/sec, at that point accuracy began to fall off as velocity increased.</p><p></p><p>There are .224 diameter bullets that are designed for 22 250 and 220 swift that will survive at their velocities and a little more. (These were the best bullets that I found for the little hot rod).</p><p></p><p>Not that it is impossible with the smaller caliber bullets, but I don't think it is practical</p><p>because of bullet problems and it will definitely shorten barrel life. (More likely to be around 500 rounds max before accuracy goes away.</p><p></p><p>The 22/250 AI or the 220 swift should get you in the ballpark of what you need with little or no problems, so that would be my recommendation for performance, loading, dies and accuracy.</p><p></p><p>Just my opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1761167, member: 2736"] There is another issue when trying to go that fast. The bullets themselves have a problem with jackets and balance at High rotational/RPM speeds. I did an experiment with high velocity .224 diameter cartridges and this is what I found. I improved a 223 WSSM and was able to get 4300 to 4400 ft/sec without to many problems. As I up the velocity, I started destroying different brands and stiles of bullets. Accuracy went out the window and at close range the target would be riddled with holes after only one shot. Instability was one of the things I discovered and jacket loss was common with some bullets starting around 4300 ft/sec. I then switch to Mono metal bullets and found the centrifugal balance caused poor accuracy at the velocity I was trying to reach. I even slowed down the twist rate to 1 in 16'' and found that this helped save some bullets. I managed to exceed 4650 without pressure signs, but found only a couple of jacketed bullets that could handle the stress of that speed and still be accurate. I even machined some solid bullets without the hollow points, (I also discovered that with high rotational forces the hollow points would actually open up enough to effect accuracy. Like everything else, there seems to be a limit to what you can do with the lightweight 22 cal bullets. My fastest accuracy load for the little WSSM ended up at 4628 ft/sec, at that point accuracy began to fall off as velocity increased. There are .224 diameter bullets that are designed for 22 250 and 220 swift that will survive at their velocities and a little more. (These were the best bullets that I found for the little hot rod). Not that it is impossible with the smaller caliber bullets, but I don't think it is practical because of bullet problems and it will definitely shorten barrel life. (More likely to be around 500 rounds max before accuracy goes away. The 22/250 AI or the 220 swift should get you in the ballpark of what you need with little or no problems, so that would be my recommendation for performance, loading, dies and accuracy. Just my opinion J E CUSTOM [/QUOTE]
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5,000 fps coyote rifle?
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