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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Berger 180 Hybrids
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<blockquote data-quote="ENGUNEER" data-source="post: 2765460" data-attributes="member: 69255"><p>The expansion of a bullet requires enough force to move the bullet metal around to cause expansion. Upon impact this force happens to be the pressure at the tip times the area. The pressure at the bullet tip is proportional to the density of the medium (ie, muscle tissue which approximates that of water) times the impact velocity squared. The area of a plugged hollow point is small causing very little force so not much expansion. However, if the hollow point is not plugged, the generated pressure has access to a much larger area and significant expansion can occur. This applies as long as the bullet velocity is high enough to cause the force necessary for expansion and that it continues nose-forward (ie, stable, not tumbling). The pressure generated on bullet impact can be many tens of thousands of pounds per square inch for velocities in the multiple thousand feet per second range.</p></blockquote><p></p>
[QUOTE="ENGUNEER, post: 2765460, member: 69255"] The expansion of a bullet requires enough force to move the bullet metal around to cause expansion. Upon impact this force happens to be the pressure at the tip times the area. The pressure at the bullet tip is proportional to the density of the medium (ie, muscle tissue which approximates that of water) times the impact velocity squared. The area of a plugged hollow point is small causing very little force so not much expansion. However, if the hollow point is not plugged, the generated pressure has access to a much larger area and significant expansion can occur. This applies as long as the bullet velocity is high enough to cause the force necessary for expansion and that it continues nose-forward (ie, stable, not tumbling). The pressure generated on bullet impact can be many tens of thousands of pounds per square inch for velocities in the multiple thousand feet per second range. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Berger 180 Hybrids
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