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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer Bullets Pressure Testing Results
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<blockquote data-quote="MagnumManiac" data-source="post: 2832677" data-attributes="member: 10755"><p>The fact is that velocity and pressure are not linear, as preached to everyone, I have proved this many times using the Pressure Trace II.</p><p>Primers aren't doing what you think they are doing, they change start pressure AND barrel time. Any time this is a gentle ignition from a compatible primer brisance, more velocity is achievable, which is why match primers MAY settle an erratic load, as does seating depth.</p><p>HBN coating dramatically changes pressure, regardless of bullet type as you say, it drops 10,000psi or more regularly. I started coating 2 brands before developing my own CNC turned bullets, Sierra and Nosler. With each, additional powder of 3-4 grains was required to get up to the uncharted bullets pressure and the start pressures were well below what was necessary for complete combustion, a faster powder was often required to get the start pressure at a happy place.</p><p></p><p>Since I sold my business, the graphs are no longer available to me, but I remember vividly all of my testing outcomes since I spent around 6 years developing the info on several calls and cartridges.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2832677, member: 10755"] The fact is that velocity and pressure are not linear, as preached to everyone, I have proved this many times using the Pressure Trace II. Primers aren’t doing what you think they are doing, they change start pressure AND barrel time. Any time this is a gentle ignition from a compatible primer brisance, more velocity is achievable, which is why match primers MAY settle an erratic load, as does seating depth. HBN coating dramatically changes pressure, regardless of bullet type as you say, it drops 10,000psi or more regularly. I started coating 2 brands before developing my own CNC turned bullets, Sierra and Nosler. With each, additional powder of 3-4 grains was required to get up to the uncharted bullets pressure and the start pressures were well below what was necessary for complete combustion, a faster powder was often required to get the start pressure at a happy place. Since I sold my business, the graphs are no longer available to me, but I remember vividly all of my testing outcomes since I spent around 6 years developing the info on several calls and cartridges. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Hammer Bullets Pressure Testing Results
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