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Hunting
Long Range Hunting & Shooting
Will too much pressure cause extreme velocity spreads?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 862859" data-attributes="member: 48043"><p>Likely just a bit larger extreme spread than perfect combined with small powder charge changes and a small sample size. I jump up to a grain or two between stops for bigger cases and don't worry much about anything but the target to start with; I've got some loads I have been loading for better than a year that haven't been chrono'd yet but they shoot just fine in any condition.</p><p> </p><p>High pressure can cause big extreme variation numbers, especially when the bolt lets loose; pretty quick pressure drop off then and you'll have a big x for that group. Kidding on that one, sort of.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /> Much more of a safety and caring for your equipment issue, but your accuracy and uniformity can go to pot with too much pressure for sure.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> The easiest pressure measurement system I've seen yet is the shoe test; take off your shoe and tap the bolt open with it. If it doesn't go easily in a tap or two, you are likely over pressure.</p><p> </p><p>A 10 fps x with a 3 moa group is still a 3 moa group.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 862859, member: 48043"] Likely just a bit larger extreme spread than perfect combined with small powder charge changes and a small sample size. I jump up to a grain or two between stops for bigger cases and don't worry much about anything but the target to start with; I've got some loads I have been loading for better than a year that haven't been chrono'd yet but they shoot just fine in any condition. High pressure can cause big extreme variation numbers, especially when the bolt lets loose; pretty quick pressure drop off then and you'll have a big x for that group. Kidding on that one, sort of.:rolleyes: Much more of a safety and caring for your equipment issue, but your accuracy and uniformity can go to pot with too much pressure for sure.:D The easiest pressure measurement system I've seen yet is the shoe test; take off your shoe and tap the bolt open with it. If it doesn't go easily in a tap or two, you are likely over pressure. A 10 fps x with a 3 moa group is still a 3 moa group. [/QUOTE]
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Will too much pressure cause extreme velocity spreads?
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