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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Length and Chamber Pressure
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<blockquote data-quote="J E Custom" data-source="post: 1771573" data-attributes="member: 2736"><p>Barrel length has the most effect on velocity. Pressure is at its max if all of the powder is consumed in the barrel. Added barrel length will increase the time the bullet spends with pressure applied but at some length the pressure has peeked and will not increase. Normally max pressure is reached at near 2/3 thirds to 3/5 of the barrel length if it is an efficient load.</p><p></p><p>If the barrel is to long the velocity gain per inch becomes less at some point because the powder has been consumed and pressure is starting to drop. Velocity will/can continue to increase, but at a lower rate. Theoretically, At some point the velocity will start to slow down if the barrel is long enough. This happens all the time on cartridges that have very small powder charges (Like the 22 LRs) </p><p></p><p>Depending on powder burn rates and volume this will occur at different barrel lengths. Go with the standard load data and start in the middle of the pressure range and you will be fine. The 2 extra inches will only increase the velocity listed if it was tested with a 24" barrel.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1771573, member: 2736"] Barrel length has the most effect on velocity. Pressure is at its max if all of the powder is consumed in the barrel. Added barrel length will increase the time the bullet spends with pressure applied but at some length the pressure has peeked and will not increase. Normally max pressure is reached at near 2/3 thirds to 3/5 of the barrel length if it is an efficient load. If the barrel is to long the velocity gain per inch becomes less at some point because the powder has been consumed and pressure is starting to drop. Velocity will/can continue to increase, but at a lower rate. Theoretically, At some point the velocity will start to slow down if the barrel is long enough. This happens all the time on cartridges that have very small powder charges (Like the 22 LRs) Depending on powder burn rates and volume this will occur at different barrel lengths. Go with the standard load data and start in the middle of the pressure range and you will be fine. The 2 extra inches will only increase the velocity listed if it was tested with a 24" barrel. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Length and Chamber Pressure
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