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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity/Neck Turning/Culling Cases:
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<blockquote data-quote="entoptics" data-source="post: 1750959" data-attributes="member: 104268"><p><span style="font-size: 14px"></span></p><p><span style="font-size: 14px">Brownells sells 2 different mandrels per caliber. </span><a href="https://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/stainless-steel-neck-turning-mandrels-prod33136.aspx" target="_blank"><span style="color: #a9b048"><strong>The</strong></span> turning mandrels</a><span style="font-size: 14px"> are 0.002" under bullet diameter, and the <a href="https://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/stainless-steel-expander-mandrels-prod33134.aspx" target="_blank">sizing mandrels</a> are 0.001" under bullet diameter.</span></p><p><span style="font-size: 14px"></span></p><p><span style="font-size: 14px">Coincidentally, my die/mandrels arrived today. In conjunction with a standard RCBS full length sizing die, stem removed, I produced 18 rounds of 270 win today with ≤0.002" runout, with only one round just shy of 0.003". My last batch of ammo with the standard die had average runout of ~0.004", with only half the rounds ≤ 0.002".</span></p><p><span style="font-size: 14px"></span></p><p>Stemless sized brass had runout of ≤0.0015", with most ≤0.001". After running through the mandrel, only one piece had increased runout of 0.002".</p><p></p><p>I use a bushing die with my 300 WM, and it is not producing ammo with this low of runout. I average about 0.002", with far more than I like going up around 0.004". I will be switching to the mandrel approach with it as well.</p><p></p><p>Besides the reduced runout, the seating force was more uniform as well. I turn my necks, and am wondering if I had some donuts. No need to worry about it any more...</p></blockquote><p></p>
[QUOTE="entoptics, post: 1750959, member: 104268"] [SIZE=14px] Brownells sells 2 different mandrels per caliber. [/SIZE][URL='https://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/stainless-steel-neck-turning-mandrels-prod33136.aspx'][COLOR=#a9b048][B]The[/B][/COLOR] turning mandrels[/URL][SIZE=14px] are 0.002" under bullet diameter, and the [URL='https://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/stainless-steel-expander-mandrels-prod33134.aspx']sizing mandrels[/URL] are 0.001" under bullet diameter. Coincidentally, my die/mandrels arrived today. In conjunction with a standard RCBS full length sizing die, stem removed, I produced 18 rounds of 270 win today with ≤0.002" runout, with only one round just shy of 0.003". My last batch of ammo with the standard die had average runout of ~0.004", with only half the rounds ≤ 0.002". [/SIZE] Stemless sized brass had runout of ≤0.0015", with most ≤0.001". After running through the mandrel, only one piece had increased runout of 0.002". I use a bushing die with my 300 WM, and it is not producing ammo with this low of runout. I average about 0.002", with far more than I like going up around 0.004". I will be switching to the mandrel approach with it as well. Besides the reduced runout, the seating force was more uniform as well. I turn my necks, and am wondering if I had some donuts. No need to worry about it any more... [/QUOTE]
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