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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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<blockquote data-quote="Bart B" data-source="post: 777761" data-attributes="member: 5302"><p>Cerwin, I think you're moving in the right direction.</p><p></p><p>My (and so darned many others) facination with full length sizing dies without expander balls is based on what the benchresters learned a few years ago. The size of benchrest smallest groups shot with a given load are not any smaller. But the size of the largest groups are smaller; 30% to 50% smaller. Benchrest group aggregates got smaller. It's sort of like deciding if you'll accept groups from 1 to 6 units of measure or 1 to 4.</p><p></p><p>Regarding neck wall irregularities being pushed to the inside and left there without an expander ball pushing them out. . . . . They're pushed back out to exactly bullet diameter when the bullet's seated. A half thousandth spread in neck wall thickness will cause a 1/2 thousandth spread in outside diameters measured around the case neck. That's not a problem. There a small amount of case neck positioning in the chamber neck while pressure builds up in the case body before the bullet gets pushed out.</p></blockquote><p></p>
[QUOTE="Bart B, post: 777761, member: 5302"] Cerwin, I think you're moving in the right direction. My (and so darned many others) facination with full length sizing dies without expander balls is based on what the benchresters learned a few years ago. The size of benchrest smallest groups shot with a given load are not any smaller. But the size of the largest groups are smaller; 30% to 50% smaller. Benchrest group aggregates got smaller. It's sort of like deciding if you'll accept groups from 1 to 6 units of measure or 1 to 4. Regarding neck wall irregularities being pushed to the inside and left there without an expander ball pushing them out. . . . . They're pushed back out to exactly bullet diameter when the bullet's seated. A half thousandth spread in neck wall thickness will cause a 1/2 thousandth spread in outside diameters measured around the case neck. That's not a problem. There a small amount of case neck positioning in the chamber neck while pressure builds up in the case body before the bullet gets pushed out. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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