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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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<blockquote data-quote="rammac" data-source="post: 1999217" data-attributes="member: 27761"><p>None of you guys seem to know how to use Quickload to it's best advantage, you don't just look at barrel time values.</p><p></p><p>I compare;</p><p>The pressure curve graph data</p><p>Fill percentage</p><p>Chamber pressure</p><p>Barrel Time</p><p>Bullet Travel at Pmax</p><p>Ballistic Efficiency</p><p></p><p>At a minimum I look at the pressure graph, chamber pressure, and the barrel time.</p><p></p><p>Getting the bullet to exit the muzzle at the right time isn't the entire picture, getting it to exit at the right time along with the proper burn characteristics is. The Z1 and Pmax values must be as close together as possible and they must coincide with the proper barrel time.</p><p>[ATTACH=full]219235[/ATTACH]</p><p></p><p>The Z1 line represents when the powder's burn characteristic changes from being progressive to being degressive, in other words, it's when the powder's burn rate can no longer keep producing enough gas to overcome the increasing bore volume as the bullet moves along the length of the barrel. Pmax is obvious. When you get Pmax and Z1 to match you get the least amount of gas pressure disturbance, it's like having the proper follow through when you throw a ball, the smoother the release the more accurate you will be.</p></blockquote><p></p>
[QUOTE="rammac, post: 1999217, member: 27761"] None of you guys seem to know how to use Quickload to it's best advantage, you don't just look at barrel time values. I compare; The pressure curve graph data Fill percentage Chamber pressure Barrel Time Bullet Travel at Pmax Ballistic Efficiency At a minimum I look at the pressure graph, chamber pressure, and the barrel time. Getting the bullet to exit the muzzle at the right time isn't the entire picture, getting it to exit at the right time along with the proper burn characteristics is. The Z1 and Pmax values must be as close together as possible and they must coincide with the proper barrel time. [ATTACH type="full" alt="1602622031029.png"]219235[/ATTACH] The Z1 line represents when the powder's burn characteristic changes from being progressive to being degressive, in other words, it's when the powder's burn rate can no longer keep producing enough gas to overcome the increasing bore volume as the bullet moves along the length of the barrel. Pmax is obvious. When you get Pmax and Z1 to match you get the least amount of gas pressure disturbance, it's like having the proper follow through when you throw a ball, the smoother the release the more accurate you will be. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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