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Rifles, Reloading, Optics, Equipment
Reloading
in or out of the lands
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<blockquote data-quote="brassprep" data-source="post: 288057"><p>The answer to your question is YES. Different primers, brass,bullets and lots thereof do create different pressure/pressure curves. Any other answer is wrong. As is the seating depth. Bullets seated by the "jam" seating method often shoot best (see many bench rest articles), however when seating against the lands, the chamber pressure will rise when compared to the same load seated off the lands, but the curve will change and may give a lower pressure at a given point along the bullet travel, ie gas port. The best way to develop a load is to use safe data, for example sierra manual, they will state the oal, the brass, the primer, and the bullet. do not exceed the max load listed-you do this and you will not "blow your head off". If you want to try to seat on the lands for your given rifle, start with the minimum listed load and work up slowly. Remember if you are using the "jam" method, and must unload your weapon, the bullet may lodge in the chamber and powder will spill from the case-seen it happen many times. Even if you get the "best" load in this manner, it may not be the best hunting load, or other purpose load, where un-loading without firing may be required.</p></blockquote><p></p>
[QUOTE="brassprep, post: 288057"] The answer to your question is YES. Different primers, brass,bullets and lots thereof do create different pressure/pressure curves. Any other answer is wrong. As is the seating depth. Bullets seated by the "jam" seating method often shoot best (see many bench rest articles), however when seating against the lands, the chamber pressure will rise when compared to the same load seated off the lands, but the curve will change and may give a lower pressure at a given point along the bullet travel, ie gas port. The best way to develop a load is to use safe data, for example sierra manual, they will state the oal, the brass, the primer, and the bullet. do not exceed the max load listed-you do this and you will not "blow your head off". If you want to try to seat on the lands for your given rifle, start with the minimum listed load and work up slowly. Remember if you are using the "jam" method, and must unload your weapon, the bullet may lodge in the chamber and powder will spill from the case-seen it happen many times. Even if you get the "best" load in this manner, it may not be the best hunting load, or other purpose load, where un-loading without firing may be required. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
in or out of the lands
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