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Rifles, Reloading, Optics, Equipment
Reloading
Video On Bump sizing cases.
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<blockquote data-quote="J E Custom" data-source="post: 1842983" data-attributes="member: 2736"><p>When possible I start with new brass to get the most life and accuracy from it. Some times This is impossible so I treat the fired brass like it was new after I anneal it.</p><p></p><p>First I do a full case prep by sizing it, uniforming the flash hole in the primer pocket, Trimming the case mouths all the same Case length, use a Mandrell style case neck turner to turn all of the case necks the exact same thickness. and then weight sort, or volume test if the cases are not the best quality. (This takes A lot longer and is more trouble than weight sorting, but can be more precision in some cases) The reason "I" do it this way is if the case is physically the same dimensions on the out side any differences on the inside in volume will/should show up and they can be sorted in batches for best accuracy/consistency.</p><p></p><p>With the cases properly prepped loading can begin, after fire forming (First time in that chamber) the fired cases will/should be concentric when checked with a good concentricity gauge. After fire forming, I always check every case for concentricity before loading. as loading begins I check each case during each step unless I get .000 runout after 6 or 8 cases are ran/dimension'd so If I have a steep that Is creating runout I can change the steep to try and eliminate runout as it happens.</p><p></p><p>I have found that sizing is one place that can alter concentricity, but bu turning the necks this is minimized because of the same thickness condition. The worst step/place I have that effects concentricity is when seating bullets. The type of dies makes a difference , a floating shell holder and die also make a difference. Some find it prudent to rotate the case 120 degrees 2 or 3 times during the bullet seating operation.</p><p></p><p>I also use many different types of dies to load for the use and accuracy of the ammo,</p><p>and I also make sure there is no oil or lubricant on the case and in the chamber. (Clean and dry).</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1842983, member: 2736"] When possible I start with new brass to get the most life and accuracy from it. Some times This is impossible so I treat the fired brass like it was new after I anneal it. First I do a full case prep by sizing it, uniforming the flash hole in the primer pocket, Trimming the case mouths all the same Case length, use a Mandrell style case neck turner to turn all of the case necks the exact same thickness. and then weight sort, or volume test if the cases are not the best quality. (This takes A lot longer and is more trouble than weight sorting, but can be more precision in some cases) The reason "I" do it this way is if the case is physically the same dimensions on the out side any differences on the inside in volume will/should show up and they can be sorted in batches for best accuracy/consistency. With the cases properly prepped loading can begin, after fire forming (First time in that chamber) the fired cases will/should be concentric when checked with a good concentricity gauge. After fire forming, I always check every case for concentricity before loading. as loading begins I check each case during each step unless I get .000 runout after 6 or 8 cases are ran/dimension'd so If I have a steep that Is creating runout I can change the steep to try and eliminate runout as it happens. I have found that sizing is one place that can alter concentricity, but bu turning the necks this is minimized because of the same thickness condition. The worst step/place I have that effects concentricity is when seating bullets. The type of dies makes a difference , a floating shell holder and die also make a difference. Some find it prudent to rotate the case 120 degrees 2 or 3 times during the bullet seating operation. I also use many different types of dies to load for the use and accuracy of the ammo, and I also make sure there is no oil or lubricant on the case and in the chamber. (Clean and dry). J E CUSTOM [/QUOTE]
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Video On Bump sizing cases.
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