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Rifles, Reloading, Optics, Equipment
Reloading
Bullet off lands?
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<blockquote data-quote="BallisticsGuy" data-source="post: 1608048" data-attributes="member: 96226"><p>Before the pedants jump on you, seating depth isn't to do with headspace. Headspace has to do with distance from breech face to a datum point forward of that. </p><p></p><p>In my experience there's no real difference in velocity from one jumped distance to another, that ignores jamming entirely. Seating depth can affect chamber pressures and group size a lot. I've found a heck of a lot of luck using .040" off the lands to get my powder charge figured out and then running a set at whatever charge weight comes of that at each of .010, .040, .080 and .120 jump. There's usually a distinct trend in resulting group size. Sometimes the trend in results toward trying a set touching or jammed is enough for me to do that but I don't like to go there. Running jammed it just causes a lot of practical problems.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1608048, member: 96226"] Before the pedants jump on you, seating depth isn't to do with headspace. Headspace has to do with distance from breech face to a datum point forward of that. In my experience there's no real difference in velocity from one jumped distance to another, that ignores jamming entirely. Seating depth can affect chamber pressures and group size a lot. I've found a heck of a lot of luck using .040" off the lands to get my powder charge figured out and then running a set at whatever charge weight comes of that at each of .010, .040, .080 and .120 jump. There's usually a distinct trend in resulting group size. Sometimes the trend in results toward trying a set touching or jammed is enough for me to do that but I don't like to go there. Running jammed it just causes a lot of practical problems. [/QUOTE]
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Bullet off lands?
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