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The Basics, Starting Out
Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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<blockquote data-quote="VinceMule" data-source="post: 3058322" data-attributes="member: 122164"><p>Mike, many of the very best 1000 yd and beyond shooters, get straighter seated ammo by running a mandrel through the neck after the Bushing size. This is why Redding puts a bushing on their Comp seater busing dies. Which mandrel to use gets complicated, along with the size of the mandrel. The bushings often introduce run out on a seated round, how anal you want to get is the question.</p><p></p><p>I have been using bushing dies for 40 years, and I am very careful to check the run-out with a run-out gauge. As you have probably found, the thicker necks may end up having more run out....it is trial and error. PMA makes a great mandrel system that you can order in .0005 increments with the mandrels running around $30 each. The long mandrel straightens the crooked neck. There may be diminishing returns as you strive you get below .002 and run out.</p><p></p><p>I copied a system used by a fellow that tests bullets for Berger at 1000 yds. which is the straightest ammo that I have ever checked the run out on. The Forster factory-honed per neck dia I order dies, followed by a Mandral using turned and non-turned necks. Run out with this system is less than .001. Again, I don't know if there is any practical improvement in groups if you go below .002 which is accomplished by several methods. Bullets with 006 run out seem to create flyers, I use those for fouling shots.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 3058322, member: 122164"] Mike, many of the very best 1000 yd and beyond shooters, get straighter seated ammo by running a mandrel through the neck after the Bushing size. This is why Redding puts a bushing on their Comp seater busing dies. Which mandrel to use gets complicated, along with the size of the mandrel. The bushings often introduce run out on a seated round, how anal you want to get is the question. I have been using bushing dies for 40 years, and I am very careful to check the run-out with a run-out gauge. As you have probably found, the thicker necks may end up having more run out....it is trial and error. PMA makes a great mandrel system that you can order in .0005 increments with the mandrels running around $30 each. The long mandrel straightens the crooked neck. There may be diminishing returns as you strive you get below .002 and run out. I copied a system used by a fellow that tests bullets for Berger at 1000 yds. which is the straightest ammo that I have ever checked the run out on. The Forster factory-honed per neck dia I order dies, followed by a Mandral using turned and non-turned necks. Run out with this system is less than .001. Again, I don't know if there is any practical improvement in groups if you go below .002 which is accomplished by several methods. Bullets with 006 run out seem to create flyers, I use those for fouling shots. [/QUOTE]
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Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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