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Hunting
Long Range Hunting & Shooting
New vs 1X Fired Brass...POI Change?
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<blockquote data-quote="FURMAN" data-source="post: 1539919" data-attributes="member: 26535"><p>The answer to your question is most often but not always. New brass is often much smaller than your chamber. Some of the energy is used to expand the brass to the chamber wall. After firing and sizing the brass is closer to the chamber dimensions. To what extant has many variables including chamber design and dies. This will use less energy to expand the brass and chamber pressures will rise. You will see this, when it happens, in higher velocity and often pressure signs with the exact same powder charge. When it happens you will most likely see a poi shift and will need to back the powder charge off to get to the same velocity. </p><p></p><p>Practical application is lets say you found an accurate load with a 180 grain bullet in a 7mm Rem Mag at 2950fps with new brass. Now you have fired all your brass and you reload the same load and velocity is near 3000fps. You will need to back powder charge off to get back to the 2950fps.</p></blockquote><p></p>
[QUOTE="FURMAN, post: 1539919, member: 26535"] The answer to your question is most often but not always. New brass is often much smaller than your chamber. Some of the energy is used to expand the brass to the chamber wall. After firing and sizing the brass is closer to the chamber dimensions. To what extant has many variables including chamber design and dies. This will use less energy to expand the brass and chamber pressures will rise. You will see this, when it happens, in higher velocity and often pressure signs with the exact same powder charge. When it happens you will most likely see a poi shift and will need to back the powder charge off to get to the same velocity. Practical application is lets say you found an accurate load with a 180 grain bullet in a 7mm Rem Mag at 2950fps with new brass. Now you have fired all your brass and you reload the same load and velocity is near 3000fps. You will need to back powder charge off to get back to the 2950fps. [/QUOTE]
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New vs 1X Fired Brass...POI Change?
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