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Rifles, Reloading, Optics, Equipment
Reloading
Help understanding neck thickness and bushing dies
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<blockquote data-quote="screamrider" data-source="post: 1065674" data-attributes="member: 52942"><p>As I get more and more OCD about this reloading business, I'm now considering switching from my Redding Deluxe Die to a Redding S type bushing die.</p><p></p><p>I've used both federal and norma brass in my 300 WSM, and plan to stick with norma going forward.</p><p></p><p>If I measure the neck OD of a once fired norma case I get a very consistent measurement of 0.3440 from 20 pieces of brass. This is fire-formed, no resizing.</p><p></p><p>For wall thickness (using standard calipers), I get a relatively consistent 0.0170.</p><p></p><p>After I FL resize with my Redding deluxe die, I get a neck OD of 0.3380</p><p></p><p>A loaded dummy round with 180 grain TTSX gives a neck OD of 0.3390</p><p></p><p>So this tells me I get 0.001 neck tension (0.3390 - 0.3380) using my Redding deluxe die.</p><p></p><p>I also see that during the resizing process I'm compressing the neck 0.006 of an inch (0.3440 - 0.3380).</p><p></p><p>According to the Redding website, I should get a bushing 0.001 less than my loaded round neck diameter, so that puts me at a 0.338 bushing. </p><p></p><p>Is it just a coincidence that the bushing I need (0.338) is the exact neck OD I get from my non-bushing redding die?</p><p></p><p>That being said, is it even worth upgrading to the bushing die? I think concentricity may be the only benefit since the brass will be worked the same, or am I missing something? Does the regular die compress the neck way below 0.338 and then the expander ball brings it back to 0.338?</p></blockquote><p></p>
[QUOTE="screamrider, post: 1065674, member: 52942"] As I get more and more OCD about this reloading business, I'm now considering switching from my Redding Deluxe Die to a Redding S type bushing die. I've used both federal and norma brass in my 300 WSM, and plan to stick with norma going forward. If I measure the neck OD of a once fired norma case I get a very consistent measurement of 0.3440 from 20 pieces of brass. This is fire-formed, no resizing. For wall thickness (using standard calipers), I get a relatively consistent 0.0170. After I FL resize with my Redding deluxe die, I get a neck OD of 0.3380 A loaded dummy round with 180 grain TTSX gives a neck OD of 0.3390 So this tells me I get 0.001 neck tension (0.3390 - 0.3380) using my Redding deluxe die. I also see that during the resizing process I'm compressing the neck 0.006 of an inch (0.3440 - 0.3380). According to the Redding website, I should get a bushing 0.001 less than my loaded round neck diameter, so that puts me at a 0.338 bushing. Is it just a coincidence that the bushing I need (0.338) is the exact neck OD I get from my non-bushing redding die? That being said, is it even worth upgrading to the bushing die? I think concentricity may be the only benefit since the brass will be worked the same, or am I missing something? Does the regular die compress the neck way below 0.338 and then the expander ball brings it back to 0.338? [/QUOTE]
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Help understanding neck thickness and bushing dies
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