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Rifles, Reloading, Optics, Equipment
Reloading
Case neck condition testing
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<blockquote data-quote="jrock" data-source="post: 2590480" data-attributes="member: 78569"><p>My interest in testing came from a rifle I got a number of years ago with a tight neck chamber. I turned the brass and used just a bushing die to size. I'd used RCBS lube on the body of the case and dipped the necks in Imperial dry lube prior to sizing. Since the bushing die only touches the outside, and I don't use expanders (yet), it left the lube on the inside of the necks for bullet seating. For some reason, with that gun, if the ammo sat on the shelf for two weeks, the MV would noticeably go up. Figured it had something to do with the neck lube change, neck tension, or possibly cold welding if the dry lube was removed during seating. I hadn't noticed any issues on other guns using expander balls and RCBS lube. That gun has sat idle for awhile due to the issue and I'd like to get it sorted out. </p><p></p><p>Adding an expander mandrel to the bushing die process sounds like a good place to start and possibly playing with neck tension. In the past few years looking into this issue, I've read that one should never use clean brass when seating a bullet as it doesn't provide consistent seating pressures. Some sort of lube seems to help the consistency. I've wondered if wet lube helps prevent cold welding since I was seeing a spike in MV with dry lube over time.</p></blockquote><p></p>
[QUOTE="jrock, post: 2590480, member: 78569"] My interest in testing came from a rifle I got a number of years ago with a tight neck chamber. I turned the brass and used just a bushing die to size. I'd used RCBS lube on the body of the case and dipped the necks in Imperial dry lube prior to sizing. Since the bushing die only touches the outside, and I don't use expanders (yet), it left the lube on the inside of the necks for bullet seating. For some reason, with that gun, if the ammo sat on the shelf for two weeks, the MV would noticeably go up. Figured it had something to do with the neck lube change, neck tension, or possibly cold welding if the dry lube was removed during seating. I hadn't noticed any issues on other guns using expander balls and RCBS lube. That gun has sat idle for awhile due to the issue and I'd like to get it sorted out. Adding an expander mandrel to the bushing die process sounds like a good place to start and possibly playing with neck tension. In the past few years looking into this issue, I've read that one should never use clean brass when seating a bullet as it doesn't provide consistent seating pressures. Some sort of lube seems to help the consistency. I've wondered if wet lube helps prevent cold welding since I was seeing a spike in MV with dry lube over time. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case neck condition testing
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