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Rifles, Reloading, Optics, Equipment
Reloading
Quickload help needed
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<blockquote data-quote="Carey Farmer" data-source="post: 2479765" data-attributes="member: 122715"><p>Apologies for my first post being such a long one, but Quickload often leaves me scratching my head.</p><p></p><p>I think we've all seen barrels "speed up" over the first hundred or so shots, even with no change in powder or charge. I recently used Quickload to model this velocity increase in two new barrels, a .264 Win Mag and a 28 Nosler. </p><p></p><p>Quickload recommends 3625 psi shot start pressure for standard jacketed bullets and 6525 psi for all-copper or fmj / hard core bullets. These are the values I used on the fresh barrels after the initial 25-shot break-in, to determine whether a Ba adjustment was needed for my lot of powder (only very small change was needed).</p><p></p><p>Over the course of the next hundred or so shots in each barrel, to match the velocity increase I had to increase start pressures by around 7000 psi. After 150 shots fired through the barrels, I settled on 12000 - 14000 psi initiation pressure for all-copper and thick-jacketed bullets (such as Tipped Game Kings or Interbonds), and 9000 - 12000 psi for softer, thin-jacketed hunting bullets such as ELD-X's.</p><p></p><p>This approach gave good agreement with subsequent observed velocities across a range of powder charges. It also yielded max pressures in good agreement with pressure signs on the softer (Nosler and Norma) cases that I use to develop loads.</p><p></p><p>As Mr. Weatherby noted sixty years ago, at long enough jumps this problem is diminished. I see lower velocities (therefore lower pressures) at shorter coal's / longer jumps with the same powder charge.</p><p></p><p>There was a post on Long Range Hunting back in 2009 that addresses some of this: <a href="https://www.longrangehunting.com/threads/quikload-start-pressure.44821/" target="_blank">https://www.longrangehunting.com/threads/quikload-start-pressure.44821/</a></p><p></p><p>I'm a Quickload novice. Would sure welcome any feedback.</p></blockquote><p></p>
[QUOTE="Carey Farmer, post: 2479765, member: 122715"] Apologies for my first post being such a long one, but Quickload often leaves me scratching my head. I think we've all seen barrels "speed up" over the first hundred or so shots, even with no change in powder or charge. I recently used Quickload to model this velocity increase in two new barrels, a .264 Win Mag and a 28 Nosler. Quickload recommends 3625 psi shot start pressure for standard jacketed bullets and 6525 psi for all-copper or fmj / hard core bullets. These are the values I used on the fresh barrels after the initial 25-shot break-in, to determine whether a Ba adjustment was needed for my lot of powder (only very small change was needed). Over the course of the next hundred or so shots in each barrel, to match the velocity increase I had to increase start pressures by around 7000 psi. After 150 shots fired through the barrels, I settled on 12000 - 14000 psi initiation pressure for all-copper and thick-jacketed bullets (such as Tipped Game Kings or Interbonds), and 9000 - 12000 psi for softer, thin-jacketed hunting bullets such as ELD-X's. This approach gave good agreement with subsequent observed velocities across a range of powder charges. It also yielded max pressures in good agreement with pressure signs on the softer (Nosler and Norma) cases that I use to develop loads. As Mr. Weatherby noted sixty years ago, at long enough jumps this problem is diminished. I see lower velocities (therefore lower pressures) at shorter coal's / longer jumps with the same powder charge. There was a post on Long Range Hunting back in 2009 that addresses some of this: [URL]https://www.longrangehunting.com/threads/quikload-start-pressure.44821/[/URL] I'm a Quickload novice. Would sure welcome any feedback. [/QUOTE]
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