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Rifles, Reloading, Optics, Equipment
Reloading
ES and SD
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<blockquote data-quote="Mikecr" data-source="post: 328230" data-attributes="member: 1521"><p>Ok, good info</p><p>Discarding string 9 and focussing on normal first shot conditions from string 2;</p><p>String 2a 1st shot = 2460</p><p>String 2b 1st shot = 2434</p><p>String 3 1st shot = 2428</p><p>String 4a 1st shot = 2424</p><p>String 4b 1st shot = 2423</p><p></p><p>Looks **** good to me. </p><p>Especially if the 1st shot, string 2a, was fouling or truly a different barrel temp than the others. That 2460 obviously came from different conditions than the rest..</p><p>Consider the ES of 2b to 4b.....11fps!</p><p>All the rest of the shots taken meant nothing at all.</p><p></p><p>But to be sure you're sitting so well, try one shot per 2hrs or so, or one shot per day if more convienient, across the EXACT same chrono setup. This setup is important because 1/8" off changes a chrono reading near the muzzle A LOT.</p><p>To make more use of this, take each on a 1"dot 300yds out. Same target, undisturbed for every shot.</p><p>With enough of an ES sample to satisfy the statistician in you, measure the furthest bullet hole on target -to center of mark. This is your cold barrel accuracy -so far.</p><p>Then do the same off a bipod in the dirt for your cold barrel 'field accuracy', if appropriate to do so.</p><p></p><p>Sure, all this takes more time and work. And that's why it's not what everyone else is doing. But it isn't killing barrels or chasing your tail either. Each shot tells you more than 10 tell most people.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 328230, member: 1521"] Ok, good info Discarding string 9 and focussing on normal first shot conditions from string 2; String 2a 1st shot = 2460 String 2b 1st shot = 2434 String 3 1st shot = 2428 String 4a 1st shot = 2424 String 4b 1st shot = 2423 Looks **** good to me. Especially if the 1st shot, string 2a, was fouling or truly a different barrel temp than the others. That 2460 obviously came from different conditions than the rest.. Consider the ES of 2b to 4b.....11fps! All the rest of the shots taken meant nothing at all. But to be sure you're sitting so well, try one shot per 2hrs or so, or one shot per day if more convienient, across the EXACT same chrono setup. This setup is important because 1/8" off changes a chrono reading near the muzzle A LOT. To make more use of this, take each on a 1"dot 300yds out. Same target, undisturbed for every shot. With enough of an ES sample to satisfy the statistician in you, measure the furthest bullet hole on target -to center of mark. This is your cold barrel accuracy -so far. Then do the same off a bipod in the dirt for your cold barrel 'field accuracy', if appropriate to do so. Sure, all this takes more time and work. And that's why it's not what everyone else is doing. But it isn't killing barrels or chasing your tail either. Each shot tells you more than 10 tell most people. [/QUOTE]
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