Dip-Casting Bullet Weight Experiments - Graybeard Outdoors
 
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post #1 of 5 (permalink) Old 03-17-2017, 10:18 PM Thread Starter
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Default Dip-Casting Bullet Weight Experiments

I just posted an article titled, Dip-Casting Bullet Weight Experiments. For some time I’ve been unsatisfied with the variations in bullets weights when dip-casting bullets for my Browning .40-65 BPCR. So I ran some experiments to identify the root cause, which turned out to be a success. For the details click on the following link: http://www.texas-mac.com/Dip-Casting...periments.html

Wayne

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post #2 of 5 (permalink) Old 03-17-2017, 10:50 PM
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Well done

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post #3 of 5 (permalink) Old 03-18-2017, 04:02 AM
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your finding appear to run counter to scientific norms.

one question

my understanding is when tin in alloyed into lead, it becomes homogeneous, therefore cannot separate into layers, as they are alloyed in the molecular level

Could you do one more experiment?

Cast, using the stir technique, X number of bullets from the top of the alloy pot, and X number from the bottom , and test for tin content.

then let your lead pot sit for 8 hours or more, then dip X bullets from the top, and bottom pour X, and test for tin

I'd be interested in the results


this has me scratching my head.... vodka, a similar alloy doesn't have the alcohol separate out of water...

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post #4 of 5 (permalink) Old 03-19-2017, 12:52 AM Thread Starter
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Quote:
Originally Posted by nanuk-o-dah-nort View Post
your finding appear to run counter to scientific norms.
one question
my understanding is when tin in alloyed into lead, it becomes homogeneous, therefore cannot separate into layers, as they are alloyed in the molecular level
Could you do one more experiment?
Cast, using the stir technique, X number of bullets from the top of the alloy pot, and X number from the bottom , and test for tin content.
then let your lead pot sit for 8 hours or more, then dip X bullets from the top, and bottom pour X, and test for tin
I'd be interested in the results
this has me scratching my head.... vodka, a similar alloy doesn't have the alcohol separate out of water...
You're not the only one that questioned my conclusion for the same reason. I did some more research and posted the following on several forums.
==================
I posted the comments and the link to my article on several other BPCR forums & received a couple of responses that has me 2nd guessing my conclusion from the experiments. The responders indicated that when tin is alloyed with lead, the result is a homogeneous mixture or solution, meaning the tin cannot separate, stratify & form a higher concentration in the upper portion of the pot as I suggested. Since additional research on the subject indicates that to be the case, Iím scratching my head and may have to run some more experiments to figure out whatís happening. There is a possibility that some of the weight changes could be related to a temperature stratification issue, but thereís no question that the percentage of tin in the alloy dropped throughout the casting sessions when the pot was not stirred. Regardless, stirring the alloy still applies.
==================

I certainly agree that additional experimenting is in order & your suggestions seem like good ones. I will report the results here.
Wayne

NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author of the Browning BPCR book
http://www.texas-mac.com
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post #5 of 5 (permalink) Old 03-19-2017, 09:10 AM
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Or you may have hit upon something? Just because it defies the accepted norm doesnt mean it is wrong; lots of other things in reloading that have gone that way.

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Many things in life are negotiable but not Honor or Integrity.
Celebrating the 2nd Independence Day of the USA as of Noon on Jan.20 2017, We have thrown off the yoke of bondage of the Dem/Socialists and taken back our Constitutional Republic.
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