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Hello all, just finished checking the concentricity of some loads and found a couple out of 50 or so that did not meet my specs, this got me to thinking what do other people do when they find this situation. So here is the question what do you do when you find some of your loads do not meet your concentricity specifications. Do you fix them and how? do you dissasemble them and start over or something else. Thanks in advance for any and all comments on the subject.  Ray NRA Life Member NAHC Life Member NRA Patriot Endowment Life Member | ||
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On ammo that I'm trying to print small groups with I fix them if they run out past .005 TIR I use a Sinclair type concentricity gauge to check runout. I use a Tru-Tool type block for "bending" the necks back into C/L Trutool For general hunting ammo I just use it without checking run out ________________________________________________ Maker of The Frankenstud Sling Keeper Proudly made in the USA Acepting all forms of payment | |||
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Shoot them, and see what happens. | |||
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To me it would seem impossible to "fix" them. I've always wondered about those ideas amd tools. Pushing on one side will change tension on the other and essentially bend the case mouth and neck open one would think.... | |||
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In a factory SAAMI chamber a full length resized cartridge is supported in the rear by the bolt face and the bullet in the throat. The body of the case does not touch the chamber walls and "guide or align" the bullet in the throat. The only part of the case that touches the chamber is the case shoulder. The late Jim Hull of the Sierra ballistic test lab and compeditive shooter jokingly said the following.... "The case should fit the chamber like a rat turd in a violin case." I have both runout gauges below.  The hornady gauge on the left holds the case as it would be held in your chamber and reads half of what the other gauge reads. And the RCBS gauge spins the case on the body, and a full length resized case body does not touch the chamber walls. The U.S. Military considers ammunition with .003 or less runout to be match grade ammo. | |||
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The few that exceed my standards (don't laugh), I put a magic marker X on them and then shoot them. I shoot them separate from my match ammo but see if they go into the same group. Quite often they do. Then I reload them and give them another chance. If they still don't prove up, into the scrap bucket they go. I actually prefer to fire cull my brass. I don't check run out on my hunting ammo. Aim for the exit hole | |||
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The Hornady run-out gauge shown above can be used to help eliminate non-concentricity - easy to do and helps in most all cases, but does not always completely straighten out the cartridge. | |||
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