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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity?
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<blockquote data-quote="boomtube" data-source="post: 494884" data-attributes="member: 9215"><p>To know what we are doing about runout we must have a concentricity gage. Sinclair's with the lower cost dial indicator is perhaps the best value available today. I use my gage to find where runout is coming from and fix it. I have no use for any such tools as Hornady's expensive 'bend 'em straight' device.</p><p> </p><p>Concentric cases are a prerequisite for concentic reloads and the cases are the most difficult problem. Conventional neck dies do nothing for concentricity that a FL die will not do. Obtaining concentric cases (necks actually) frequently requires neck turning to uniform the common manufactoring inconsistances. The "best' neck turners are hand held tools and the best of them are quite costly but loosely fitted factory chamber rifles don't even benefit from such precision. I believe the Forster (HOT-100) hand turner is the best value on the market for factory chambers, about $50 from MidwayUSA last time I looked. Use one to skim turn most necks about 60-80% and that's as thin as we can benefit from. Then we need a sizer-expander combo that won't 'bend' our nicely uniformed necks. For factory rifles I prefer the Lee Collet neck sizer for straight necks; for "FL" sizing I use a 'body die' and follow that with the Collet sizer. </p><p> </p><p>Seating at/in the lands is a BR technique for their tightly fitted chambers and not all BR shooters do it. Few factory rifles shooting with common cases and bullets do their best seated against the lands. I suggest starting from 20 to 30 thou off the lands until finding the best charge weight, t<u>hen</u> vary the seating depth <u>in and out</u> in maybe 5 thou steps while using that charge until you find the BEST OAL.</p><p> </p><p>IF your conventional seater die has tolerances that work together it will seat as precisely as any other but that's not common. Most conventional seater dies are moderately precise and there is no real advantage to any given brand that I've been able to measure. But, Forster's BR and Redding's Competition seaters ARE consistantly very good. NONE of the other threaded type so-called "comp" dies, at any price, give any better concentricity on average than less costly conventional seaters. IMHO.</p><p> </p><p>No matter what we do, some cases will persist in run-out problems. Any that continue to show significant run-out after all my processes get tossed.</p></blockquote><p></p>
[QUOTE="boomtube, post: 494884, member: 9215"] To know what we are doing about runout we must have a concentricity gage. Sinclair's with the lower cost dial indicator is perhaps the best value available today. I use my gage to find where runout is coming from and fix it. I have no use for any such tools as Hornady's expensive 'bend 'em straight' device. Concentric cases are a prerequisite for concentic reloads and the cases are the most difficult problem. Conventional neck dies do nothing for concentricity that a FL die will not do. Obtaining concentric cases (necks actually) frequently requires neck turning to uniform the common manufactoring inconsistances. The "best' neck turners are hand held tools and the best of them are quite costly but loosely fitted factory chamber rifles don't even benefit from such precision. I believe the Forster (HOT-100) hand turner is the best value on the market for factory chambers, about $50 from MidwayUSA last time I looked. Use one to skim turn most necks about 60-80% and that's as thin as we can benefit from. Then we need a sizer-expander combo that won't 'bend' our nicely uniformed necks. For factory rifles I prefer the Lee Collet neck sizer for straight necks; for "FL" sizing I use a 'body die' and follow that with the Collet sizer. Seating at/in the lands is a BR technique for their tightly fitted chambers and not all BR shooters do it. Few factory rifles shooting with common cases and bullets do their best seated against the lands. I suggest starting from 20 to 30 thou off the lands until finding the best charge weight, t[U]hen[/U] vary the seating depth [U]in and out[/U] in maybe 5 thou steps while using that charge until you find the BEST OAL. IF your conventional seater die has tolerances that work together it will seat as precisely as any other but that's not common. Most conventional seater dies are moderately precise and there is no real advantage to any given brand that I've been able to measure. But, Forster's BR and Redding's Competition seaters ARE consistantly very good. NONE of the other threaded type so-called "comp" dies, at any price, give any better concentricity on average than less costly conventional seaters. IMHO. No matter what we do, some cases will persist in run-out problems. Any that continue to show significant run-out after all my processes get tossed. [/QUOTE]
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