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Rifles, Reloading, Optics, Equipment
Reloading
effect of small differences in OAL
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<blockquote data-quote="jsthntn247" data-source="post: 965437" data-attributes="member: 14894"><p>After you find your powder charge, load up a seating depth test in .003-.005 increments. Example: my .308 with 175 gr SMK's shot a bad group high and left of the dot at a touch, then a one hole group dead center of the dot .005 off, then went high and left with a bad group at .010 off, then a good group dead center low at .015. then another good group dead center low at .020 off, then another decent group dead center low at .025, then all over after that. I would pick .017 as my seating depth to give me .002 either way and still have the same point of impact and group size. If .025 had shot just as good as .015 and .020, then .020 would be my seating depth and I could have .005 either way of wiggle room. A seating depth test will tell you where you want to be and how much wiggle room you have for errorr without affecting poi. Even though .005 off shot the best group, it will not be as easy to load for (0 wiggle room) and not as consistent from day to day.</p></blockquote><p></p>
[QUOTE="jsthntn247, post: 965437, member: 14894"] After you find your powder charge, load up a seating depth test in .003-.005 increments. Example: my .308 with 175 gr SMK's shot a bad group high and left of the dot at a touch, then a one hole group dead center of the dot .005 off, then went high and left with a bad group at .010 off, then a good group dead center low at .015. then another good group dead center low at .020 off, then another decent group dead center low at .025, then all over after that. I would pick .017 as my seating depth to give me .002 either way and still have the same point of impact and group size. If .025 had shot just as good as .015 and .020, then .020 would be my seating depth and I could have .005 either way of wiggle room. A seating depth test will tell you where you want to be and how much wiggle room you have for errorr without affecting poi. Even though .005 off shot the best group, it will not be as easy to load for (0 wiggle room) and not as consistent from day to day. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
effect of small differences in OAL
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