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Rifles, Reloading, Optics, Equipment
Reloading
donuts to go
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<blockquote data-quote="VinceMule" data-source="post: 3007356" data-attributes="member: 122164"><p>Mikiecr advice is accurate.</p><p></p><p>I neck turn slightly into the Neck shoulder junction on the parent case going up or down in my case forming. A nit picker would turn again at the desired fully formed caliber as there may be .0003 run out on the neck turned formed up/down case. The second neck turning would result in run out from .0000-.0001 as long as your method remained constant.</p><p></p><p>When I formed 6 and 22 PPC out of PMC 7.62x39 brass, I shoot warm loads where the accuracy node is. IN 10 or so firings, some of the brass would still form doughnuts. I had brass Rockwell tested, and over a lot number, there may be 6% variation in hardness, which explains why the soft brass would develop doughnuts.</p><p></p><p>Anyone who has ever owned a 220 Swift, knows about how necks thicken over firings, and brass flowing from the case body to the case neck where tapered neck thickness can drive you crazy when trying to achieve very high levels of accuracy.</p><p></p><p>Much of the difficulty on neck turning has been removed by companies that sell:</p><p></p><p>A. Expansion mandrel</p><p></p><p>B. Turning mandrel</p><p></p><p>With a set of their tools. Even a novice can achieve .0002 run out with the two above tools while turning necks with the neck turning tool chucked in a variable 1/2" drill(speed control wheel on the trigger). Old-style neck turners that only came with a neck-turning mandrel could achieve .0005 run out, which is still better than most new factory brass run out.</p><p></p><p>K&M makes a good set for a novice to dive into the neck-turning.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 3007356, member: 122164"] Mikiecr advice is accurate. I neck turn slightly into the Neck shoulder junction on the parent case going up or down in my case forming. A nit picker would turn again at the desired fully formed caliber as there may be .0003 run out on the neck turned formed up/down case. The second neck turning would result in run out from .0000-.0001 as long as your method remained constant. When I formed 6 and 22 PPC out of PMC 7.62x39 brass, I shoot warm loads where the accuracy node is. IN 10 or so firings, some of the brass would still form doughnuts. I had brass Rockwell tested, and over a lot number, there may be 6% variation in hardness, which explains why the soft brass would develop doughnuts. Anyone who has ever owned a 220 Swift, knows about how necks thicken over firings, and brass flowing from the case body to the case neck where tapered neck thickness can drive you crazy when trying to achieve very high levels of accuracy. Much of the difficulty on neck turning has been removed by companies that sell: A. Expansion mandrel B. Turning mandrel With a set of their tools. Even a novice can achieve .0002 run out with the two above tools while turning necks with the neck turning tool chucked in a variable 1/2" drill(speed control wheel on the trigger). Old-style neck turners that only came with a neck-turning mandrel could achieve .0005 run out, which is still better than most new factory brass run out. K&M makes a good set for a novice to dive into the neck-turning. [/QUOTE]
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