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<blockquote data-quote="Shootin4fun" data-source="post: 1676080" data-attributes="member: 28741"><p>This is what I have experienced in my 7RM as well. If I only NS, bumping .002 when I do FL size, then about 2 - 4 firings will require FL sizing again. Here we go back into the debate of FL vs neck sizing. Because when we NS, each time we fire, the case is pushing the shoulder out and it is not being made consistent with previous firings. A guy has a whole video on one of our other threads here exhorting the reasons NOT to NECK SIZE. It makes sense to FL size every time, having the die set to bump .001 - ,002. That way the cases are always the same dimentions, no capacity change, no energy expended in expanding the brass a different amount when it finally hits the chamber shoulder area (requiring another bump). But I have not done controlled experiments over say 4 firings to compare velocity or POI changes as the NS cases' shoulder grows. Generally, I can't say I see a POI shift as they grow. And I have not compared my chrono results looking for a pattern over successive NS firings. I have been NS my 7RM and 6.5CM for a few years now. It's so much easier and faster. But on the 6.5 I am reverting back to FL every time. For one thing, it seems to me that it forces better runout numbers. The case is fully supported by the sidewalls of a FL die so the neck always hits the bushing in the same axial position every time. With NS, axial alignment variances can occur. Just my own ponderings...</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 1676080, member: 28741"] This is what I have experienced in my 7RM as well. If I only NS, bumping .002 when I do FL size, then about 2 - 4 firings will require FL sizing again. Here we go back into the debate of FL vs neck sizing. Because when we NS, each time we fire, the case is pushing the shoulder out and it is not being made consistent with previous firings. A guy has a whole video on one of our other threads here exhorting the reasons NOT to NECK SIZE. It makes sense to FL size every time, having the die set to bump .001 - ,002. That way the cases are always the same dimentions, no capacity change, no energy expended in expanding the brass a different amount when it finally hits the chamber shoulder area (requiring another bump). But I have not done controlled experiments over say 4 firings to compare velocity or POI changes as the NS cases' shoulder grows. Generally, I can't say I see a POI shift as they grow. And I have not compared my chrono results looking for a pattern over successive NS firings. I have been NS my 7RM and 6.5CM for a few years now. It's so much easier and faster. But on the 6.5 I am reverting back to FL every time. For one thing, it seems to me that it forces better runout numbers. The case is fully supported by the sidewalls of a FL die so the neck always hits the bushing in the same axial position every time. With NS, axial alignment variances can occur. Just my own ponderings... [/QUOTE]
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