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Rifles, Reloading, Optics, Equipment
Reloading
Why Hammer Bullets Are Always Faster
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<blockquote data-quote="fta0303" data-source="post: 3040307" data-attributes="member: 43503"><p>There is pressure and pressure. SAAMI sets limits on peak pressure. The pressure that's effective for driving a bullet at a given velocity (effective pressure) is more of an average pressure over the time the bullet is in the barrel. Efffective pressure is a different beast than peak pressure. A flatter combustion pressure profile can allow increased velocity within the same peak pressure. Decreased barrel friction will allow higher velocity. Barrel friction is one of the forces that must be considered in the force balance that drives velocity; what force is not used to overcome barrel friction is available to increase acceleration within the gun..</p></blockquote><p></p>
[QUOTE="fta0303, post: 3040307, member: 43503"] There is pressure and pressure. SAAMI sets limits on peak pressure. The pressure that's effective for driving a bullet at a given velocity (effective pressure) is more of an average pressure over the time the bullet is in the barrel. Efffective pressure is a different beast than peak pressure. A flatter combustion pressure profile can allow increased velocity within the same peak pressure. Decreased barrel friction will allow higher velocity. Barrel friction is one of the forces that must be considered in the force balance that drives velocity; what force is not used to overcome barrel friction is available to increase acceleration within the gun.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Why Hammer Bullets Are Always Faster
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