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Old 05-28-2010, 01:20 PM
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WW Super vs Winchester 30-06 brass


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Should I keep these two types of brass separate for reloading Or are they essentially equal?
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Old 05-28-2010, 01:40 PM
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I always separate brass lots by type. There are large differences in the internal volumes of different case types, even case lots of the same type, that can make differences.

Whenever I set off small explosions next to my face, I like to control ALL the variables I can.
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Old 05-28-2010, 02:54 PM
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Check the capacity, as noted above, it can vary by lot and headstamp. If, however, they end up very close to the same then I wouldn't worry about it. Do keep track of how many times you fire each case though.
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Old 05-30-2010, 05:38 AM
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Quote:
Originally Posted by brewster7 View Post
Should I keep these two types of brass separate for reloading Or are they essentially equal?
If you have a digital scale, give this a try. There is a Mil-Std statistical proceedure to establish just about anything with a specification.

When you order up a bag of brass, thake the square root of the number off cases in the order + 1. 11 cases from a hundred, 23 cases from 500, and weigh them on the digital. Average the values, or if you're a real artist, enter the values into Excel, and use the stat features. Record the data in your reloading log book. I use a standard Research notebook, with binding and a hard cover.

I have records of .223/.243/.30-06/7mm Mag over many years, (17 to be exact), there is enough variation to want to know about it, with 7RM being the worst, but there's no real trend with W-W/Super-X. I have never seen enough difference to be a problem.

Switching headstamps, there is far more variation. One of the worst as a percent of weight is 9 X 19mm, making you wonder about reloads with a mixed head stamp.
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Old 05-30-2010, 05:52 AM
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Thanks guys. Dad taught me not to mix headstamps but I must have fallen asleep when he started the "internal capacity" lesson. Now that I've been advised about the truth, it makes really good sense. Fortunately there have been no serious consequences to date. I'll be safer from now on.
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Old 05-31-2010, 12:59 PM
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Assuming they have been fired the same number of times, it shouldn't really matter provded your loads aren't to the maximum, and are just for plinking and hunting (normal yardages.) If your have a mid range loading and only intend on shooting deer at a max of 200 yards you'll be fine.

Obviously if you have fired one group 15 times and the other only once there is a wear and tear issue with the 15 shots group. And if you're entering a target competition you'll be sorting out brass anyway.

Keep in mind, you can buy used bulk brass that doesn't match. If it were dangerous they wouldn't be doing this.
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Old 05-31-2010, 04:54 PM
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I would modify Tman's recommendation to use the square root of the lot size+1 or 30, whichever is larger. It takes about 30 samples to get an average that is reasonably certain to be representative of the lot (symmetrical bell curve). On lots larger than 7071, use 84 samples and don't bother going larger (which is what I recall I saw the last time I looked at military destructive testing sample size testing). So, 30 to 84 samples, no more, no less.
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