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Help, Case Neck Tension

 
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  #8  
Old 01-13-2008, 11:49 AM
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Location: bakersfield ca.
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One more Question, what is acceptable in bullet run out? I bought the sinclair concentricity guage because Buffalo Bob recommended it. I just don't know what acceptable tolerances are on case neck and bullet run out.
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  #9  
Old 01-14-2008, 12:15 PM
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still looking for an answer on runnout?
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  #10  
Old 01-14-2008, 12:38 PM
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The amount of runout acceptable to your situation greatly depends on what you're trying to accomplish and what your rifle is capable of.

Zero runout is the goal, but you may never see the benefits of it depending on your rifle. If the variables in your rifle are of such loose tolerances, zero runout in your cartridges will help, but not to the degree to show drastic improvement over .001-.003 or maybe more.

You have to consider all of the variables. Control the ones you can and work around the ones you can't. Also, if you're gonna split hairs...sort your loaded rounds into runout groups and test them. You may find a runout threshold that trying to get under won't show a marked improvement in accuracy. That will be YOUR acceptable runout.
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  #11  
Old 01-14-2008, 01:00 PM
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thanks Brian, guess I need to head to the range with a note book.
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  #12  
Old 01-16-2008, 11:58 AM
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Piute mike

please look up the in-depth post I did on total runout. It is all you need to know except what tool but you should have the ability to QC your reloads and to sort for purposes / ranges. Send me a pm if you can not find the post. We are here to serve the new shooters.
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  #13  
Old 01-17-2008, 06:11 PM
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Just want to make sure I have this right....I'm loading a .300 RUM. Before resizing my i.d. is also .310. After resizing it is .304. My Berger 210VLD's measure .308. Will this give me enough neck tension? I see that JE Custom said he would shoot for .300 or .008 less than the bullet. I just figured that the size of the expander ball on the RCBS FL die was giving me the proper size and neck tension.
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  #14  
Old 01-17-2008, 06:25 PM
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Quote:
Originally Posted by indiansumer View Post
Just want to make sure I have this right....I'm loading a .300 RUM. Before resizing my i.d. is also .310. After resizing it is .304. My Berger 210VLD's measure .308. Will this give me enough neck tension? I see that JE Custom said he would shoot for .300 or .008 less than the bullet. I just figured that the size of the expander ball on the RCBS FL die was giving me the proper size and neck tension.
Inside neck diameter is difficult to measure accurately unless you have special gauges. Caliper blades are flat and shouldn't be used to measure concave surfaces. Outside neck measurements will be fine.

How much neck tension is NEEDED? - IMO about .002" of neck tension is adequate for most hunting rifles. BR guys often use less and autoloading rifles would benefit by more. Either way, .002"-.003" is a good range. More tension isn't really going to hurt anything except the life of the overworked necks. However, .008" would require much more setting pressure than I would like.
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