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Rifles, Reloading, Optics, Equipment
Reloading
220 Swift OCW testing. Where do i go from here??
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<blockquote data-quote="Mike 338" data-source="post: 1075745" data-attributes="member: 41338"><p>Once you find your OCW, I'd test primers (5 shots). I try to have a good selection of primers on hand and I try them all. The one that's "supposed" to be awesome isn't always the case. Then fine tune seating depth assuming you've already located a rough sweet spot. Then fine tune powder charge in .1 or .2 grain increments in each direction but stay fairly close to your OCW. </p><p></p><p>To answer your question of "isn't it all exponential"... that's the theory. The idea of finding your OCW, which can also be done with a ladder test, is to build loads within a band that produces "stable" results. When a person builds loads which may not have stable characteristics, very minor variations may upset how that load performs, such as case wall thickness, lot to lot powder variations, lot to lot bullet variations, minor temp variations and so on. Bug holes one day can open up quite a bit another day with jumpy loads and adding more distance only exposes this as well as everything else that isn't quite right. I wouldn't assume 1/2 MOA @ 100 yds is 1/2 MOA @ 400 until you've confirmed it.</p><p></p><p>I think flashhole is right that accuracy testing is better done at somewhat longer distances. I like about 150 to 200 yds or a distance that wind won't play a significant role. Ladder tests, which may be the best method but requires an inherently accurate rifle and at least 300 yards or more so the OCW test is a good way develop loads on shorter ranges.</p></blockquote><p></p>
[QUOTE="Mike 338, post: 1075745, member: 41338"] Once you find your OCW, I'd test primers (5 shots). I try to have a good selection of primers on hand and I try them all. The one that's "supposed" to be awesome isn't always the case. Then fine tune seating depth assuming you've already located a rough sweet spot. Then fine tune powder charge in .1 or .2 grain increments in each direction but stay fairly close to your OCW. To answer your question of "isn't it all exponential"... that's the theory. The idea of finding your OCW, which can also be done with a ladder test, is to build loads within a band that produces "stable" results. When a person builds loads which may not have stable characteristics, very minor variations may upset how that load performs, such as case wall thickness, lot to lot powder variations, lot to lot bullet variations, minor temp variations and so on. Bug holes one day can open up quite a bit another day with jumpy loads and adding more distance only exposes this as well as everything else that isn't quite right. I wouldn't assume 1/2 MOA @ 100 yds is 1/2 MOA @ 400 until you've confirmed it. I think flashhole is right that accuracy testing is better done at somewhat longer distances. I like about 150 to 200 yds or a distance that wind won't play a significant role. Ladder tests, which may be the best method but requires an inherently accurate rifle and at least 300 yards or more so the OCW test is a good way develop loads on shorter ranges. [/QUOTE]
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220 Swift OCW testing. Where do i go from here??
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