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Rifles, Reloading, Optics, Equipment
Reloading
Redding s type die advice
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<blockquote data-quote="RegionRat" data-source="post: 1567526" data-attributes="member: 57231"><p>Let us assume you are going to target a 0.002" diameter reduction for grip on the necks.</p><p>If you measured .340 then your goal is 0.340 - 0.002 = 0.338</p><p>If you measured .341 then your goal is 0.341 - 0.002 = 0.339</p><p></p><p>Grip diameter for neck tension is a parameter that isn't set in stone, it needs to be developed by experimentation. If it were me, I would order each bushing from 0.336 to 0.339 just to be able to cover a batch of brass that needs trimming or one that comes in fat. You may settle on one quickly and never touch the others again, or you may find the need to move up or down one depending on the anneal state of the cases. I don't run the expander ball in the dies any more, but sometimes I use the expander mandrel to condition the necks after trimming and chamfering. I also ordered precision ground expander mandrels in fine increments to have my contingencies ready.</p><p></p><p>As for controlling the shoulder datum and sizing, my advice is to play it safe as a baseline and minimally bump with the body die every time. Yes, you can get away with neck sizing to a degree, but sooner or later the cases will be difficult to chamber or extract. If you can tolerate an experiment, see if one that is sized down more than necessary groups differently than ones that are just bumped or neck only. You will likely find there isn't any significant difference. If that is the finding, you would always bump the shoulders for reliable feeding and extraction. YMMV</p><p></p><p>BTW, is that 30 Nosler brass really that thick? I mean (0.341 - 0.3085)/2= 0.0163 thick neck walls? My 30 cal no-turn neck chambers are 0.340 diameter. I didn't realize the Nosler brass was that thick.</p></blockquote><p></p>
[QUOTE="RegionRat, post: 1567526, member: 57231"] Let us assume you are going to target a 0.002" diameter reduction for grip on the necks. If you measured .340 then your goal is 0.340 - 0.002 = 0.338 If you measured .341 then your goal is 0.341 - 0.002 = 0.339 Grip diameter for neck tension is a parameter that isn't set in stone, it needs to be developed by experimentation. If it were me, I would order each bushing from 0.336 to 0.339 just to be able to cover a batch of brass that needs trimming or one that comes in fat. You may settle on one quickly and never touch the others again, or you may find the need to move up or down one depending on the anneal state of the cases. I don't run the expander ball in the dies any more, but sometimes I use the expander mandrel to condition the necks after trimming and chamfering. I also ordered precision ground expander mandrels in fine increments to have my contingencies ready. As for controlling the shoulder datum and sizing, my advice is to play it safe as a baseline and minimally bump with the body die every time. Yes, you can get away with neck sizing to a degree, but sooner or later the cases will be difficult to chamber or extract. If you can tolerate an experiment, see if one that is sized down more than necessary groups differently than ones that are just bumped or neck only. You will likely find there isn't any significant difference. If that is the finding, you would always bump the shoulders for reliable feeding and extraction. YMMV BTW, is that 30 Nosler brass really that thick? I mean (0.341 - 0.3085)/2= 0.0163 thick neck walls? My 30 cal no-turn neck chambers are 0.340 diameter. I didn't realize the Nosler brass was that thick. [/QUOTE]
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Redding s type die advice
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