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Rifles, Reloading, Optics, Equipment
Reloading
Load development/fireforming
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<blockquote data-quote="Fiftydriver" data-source="post: 76654" data-attributes="member: 10"><p>Cowboy,</p><p></p><p>I actually tried this when I started playing with my 270 Allen Mag wildcat. Figured I would see how fast I could push the round in a fireforming load, basically as an experiment.</p><p></p><p>I will tell you that even in a properly headspaced rifle set up with a 0.004" crush fit on the case like my rounds and the Ackley rounds should have, you will reach a point where case head seperation will still become a problem.</p><p></p><p>The reason I believe is that the top end pressures just force out the case to violently. They just do not have time to stretch to fill out the chamber and the case will begin to seperate at the case head.</p><p></p><p>In my round, I got to 3200 fps with the 169.5 gr ULD RBBT in virgin brass when this started happening.</p><p></p><p>Also, the energy required to form the case will result in different performance once that same load is used in a formed case.</p><p></p><p>For this reason I use the lightest load that blows the shoulders out sharply and then develop loads after that. Case will last much longer that way.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 76654, member: 10"] Cowboy, I actually tried this when I started playing with my 270 Allen Mag wildcat. Figured I would see how fast I could push the round in a fireforming load, basically as an experiment. I will tell you that even in a properly headspaced rifle set up with a 0.004" crush fit on the case like my rounds and the Ackley rounds should have, you will reach a point where case head seperation will still become a problem. The reason I believe is that the top end pressures just force out the case to violently. They just do not have time to stretch to fill out the chamber and the case will begin to seperate at the case head. In my round, I got to 3200 fps with the 169.5 gr ULD RBBT in virgin brass when this started happening. Also, the energy required to form the case will result in different performance once that same load is used in a formed case. For this reason I use the lightest load that blows the shoulders out sharply and then develop loads after that. Case will last much longer that way. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Load development/fireforming
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