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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy due to velocity, charge, or random...?
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<blockquote data-quote="entoptics" data-source="post: 1587725" data-attributes="member: 104268"><p>All the rifles I've loaded for are factory, though the 300WM in question has a Shilen barrel installed. I've never found a "node" for any gun, in the dozen or so times I've tried it. I've found recipes that work better than others, but only large variations have affected measurable precision. For instance changing the bullet type, big changes in powder load density, or huge changes in seating depth.</p><p></p><p>None of my rifles are bug holers though. About 3/4 to 1 MOA is all I've ever gotten out of them (on average, not "that one group that one time"). Perhaps someday I'll get a Ruger American in 6.5 Creedmoor, and then I can tune it to a "node" and take it from 0.25 MOA down to 0.1 MOA. At least that's what I read on the interwebs...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>[USER=68875]@lancetkenyon[/USER]. The new brass is definitely WAY shorter. Shoulder datum is 0.01" shorter than once fired. This has been my experience with Winchester, Norma, and now Sig. They sure do rely on the belt for headspace when they make those puppies. Factory ammo tends to measure similar too. I usually run the shoulder down about 0.002" when I resize after the first firing.</p><p></p><p>I'll do some experiments with the new brass, and see if I can get the same accuracy as before, just by tuning the load down to the same speeds. Preliminary data indicates about 2 grains less of H1000. Hopefully going out tomorrow. 20°, but at least it won't be snowing, and the wind should be calm...</p></blockquote><p></p>
[QUOTE="entoptics, post: 1587725, member: 104268"] All the rifles I've loaded for are factory, though the 300WM in question has a Shilen barrel installed. I've never found a "node" for any gun, in the dozen or so times I've tried it. I've found recipes that work better than others, but only large variations have affected measurable precision. For instance changing the bullet type, big changes in powder load density, or huge changes in seating depth. None of my rifles are bug holers though. About 3/4 to 1 MOA is all I've ever gotten out of them (on average, not "that one group that one time"). Perhaps someday I'll get a Ruger American in 6.5 Creedmoor, and then I can tune it to a "node" and take it from 0.25 MOA down to 0.1 MOA. At least that's what I read on the interwebs...;) [USER=68875]@lancetkenyon[/USER]. The new brass is definitely WAY shorter. Shoulder datum is 0.01" shorter than once fired. This has been my experience with Winchester, Norma, and now Sig. They sure do rely on the belt for headspace when they make those puppies. Factory ammo tends to measure similar too. I usually run the shoulder down about 0.002" when I resize after the first firing. I'll do some experiments with the new brass, and see if I can get the same accuracy as before, just by tuning the load down to the same speeds. Preliminary data indicates about 2 grains less of H1000. Hopefully going out tomorrow. 20°, but at least it won't be snowing, and the wind should be calm... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy due to velocity, charge, or random...?
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