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Rifles, Reloading, Optics, Equipment
Reloading
Does a crush fit change pressures?
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<blockquote data-quote="Fitch" data-source="post: 413042" data-attributes="member: 19372"><p>I have to agree completely. With everything else the same, and the bullets not in contact with the lands, pressure is determined by the size of the chamber, not the fit of the brass. The brass will expand to chamber size well before peak pressure is reached so it shouldn't have much if any effect at all, certainly not enough to cause 100 fps difference in MV.</p><p></p><p>Brass brands can definitely make that big, or even bigger, difference. Seating the bullets into the lands, or not, will also make that much or more difference, but not shoulder bump.</p><p></p><p>Accuracy improvements might be do to the brass being more uniformly concentric with the throat in the crush fit case. </p><p></p><p>I can't really account for the 100 fps.</p><p></p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 413042, member: 19372"] I have to agree completely. With everything else the same, and the bullets not in contact with the lands, pressure is determined by the size of the chamber, not the fit of the brass. The brass will expand to chamber size well before peak pressure is reached so it shouldn't have much if any effect at all, certainly not enough to cause 100 fps difference in MV. Brass brands can definitely make that big, or even bigger, difference. Seating the bullets into the lands, or not, will also make that much or more difference, but not shoulder bump. Accuracy improvements might be do to the brass being more uniformly concentric with the throat in the crush fit case. I can't really account for the 100 fps. Fitch [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Does a crush fit change pressures?
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