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The Range
Ammo & Reloading
Semi-Auto Reloading Question
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<blockquote data-quote="diggler1833" data-source="post: 4014785" data-attributes="member: 48072"><p>Sorry to hear about your situation. </p><p></p><p>Whoever wrote what you read, made a generalization that is usually more incorrect than it is right.</p><p></p><p>As already noted above: small base dies for semi autos add a bit of insurance for reliable feeding because they get the entire body of the case back down. Most standard dies will stop sizing on the case body that last 10-15% up from the base (case head). Most small base dies will also compress the brass an additional .0005 - .001. Great for reliable feeding...less great for brass longevity. </p><p></p><p>I use small base dies in my 6.5 Grendel and 6.8 SPC...but I continue to use a standard die for my .223 and .308. I haven't noticed any reliability differences...but that is just me. YMMV. I also set mine to bump the shoulder .004 in gas guns. That might be excessive to some, but it works for me.</p><p></p><p>I'll add that neck sizing only was a trend for a while, but is now rapidly fading among experienced reloaders. Way too many occurrences of chamber's not having been cut perfectly uniform...and then you run into needing extra force to chamber and extract reloads because the next time that case is loaded it might be 180 degrees from when it was last fired. That's less of an issue on a bolt gun...but not something you want to add to a semi auto. It also frequently doesn't give the extra accuracy advantage that many proponents originally claimed. Really, the argument FOR neck sizing is just longer brass life, and it should really only be done in a bolt gun.</p></blockquote><p></p>
[QUOTE="diggler1833, post: 4014785, member: 48072"] Sorry to hear about your situation. Whoever wrote what you read, made a generalization that is usually more incorrect than it is right. As already noted above: small base dies for semi autos add a bit of insurance for reliable feeding because they get the entire body of the case back down. Most standard dies will stop sizing on the case body that last 10-15% up from the base (case head). Most small base dies will also compress the brass an additional .0005 - .001. Great for reliable feeding...less great for brass longevity. I use small base dies in my 6.5 Grendel and 6.8 SPC...but I continue to use a standard die for my .223 and .308. I haven't noticed any reliability differences...but that is just me. YMMV. I also set mine to bump the shoulder .004 in gas guns. That might be excessive to some, but it works for me. I'll add that neck sizing only was a trend for a while, but is now rapidly fading among experienced reloaders. Way too many occurrences of chamber's not having been cut perfectly uniform...and then you run into needing extra force to chamber and extract reloads because the next time that case is loaded it might be 180 degrees from when it was last fired. That's less of an issue on a bolt gun...but not something you want to add to a semi auto. It also frequently doesn't give the extra accuracy advantage that many proponents originally claimed. Really, the argument FOR neck sizing is just longer brass life, and it should really only be done in a bolt gun. [/QUOTE]
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