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Very Hot Topic (More than 25 Replies) Alloy Percentages (Read 27346 times)
CW
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Re: Alloy Percentages
Reply #90 - Mar 1st, 2019 at 9:30pm
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NO.

Alloy calculators have not been accurate in all cases in my experience.
For me it has been much better to work from my own testing. 

These kind is errors were part of the discussions I would have with Art Green and Bill Ferguson early on until I just learned that not all things offered as correct in this world, are..... then just move on and don't worry about it.

What are your goals? 
Work on your goals.
Don't worry about what others say you can't do.

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frnkeore
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Re: Alloy Percentages
Reply #91 - Mar 2nd, 2019 at 3:52pm
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BP wrote on Mar 1st, 2019 at 6:02pm:
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...
It is 3 parts Lyman #2 and 7 parts pure lead.
...

3 parts #2 Metal to 7 parts Pb gives a #2:Pb ratio of 1:2.333

Looking at the Lyman #38 handbook, Lyman provided a chart showing that a mix of 1 part #2 Metal to 2 parts Pb (#2:Pb with a ratio of 1:2.000) was equivalent in hardness to a Sn:Pb alloy having a ratio of 1:30.

If the numbers in the Lyman chart are correct, and going by the alloy hardness equivalents provided, it would appear that the "3 parts Lyman #2 and 7 parts pure lead" would end up softer than the 1:30 Sn:Pb  hardness.
Is this correct?

There at least 2 mixes for #2, the later one is the one that I used, back in the 80's and early 90's for CBA matches.

That formula is 5% tin/95% WW (about 2% short on antimony). the original formula is 90% lead, 5% tin and 5% antimony. Lyman also gives 2 other formulas that mix lead, 50/50 solder, lino and WW's, to give appox #2.

Frank
  
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BP
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Re: Alloy Percentages
Reply #92 - Mar 2nd, 2019 at 4:14pm
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frnkeore wrote on Mar 2nd, 2019 at 3:52pm:
BP wrote on Mar 1st, 2019 at 6:02pm:
Quote:

...
It is 3 parts Lyman #2 and 7 parts pure lead.
...

3 parts #2 Metal to 7 parts Pb gives a #2:Pb ratio of 1:2.333

Looking at the Lyman #38 handbook, Lyman provided a chart showing that a mix of 1 part #2 Metal to 2 parts Pb (#2:Pb with a ratio of 1:2.000) was equivalent in hardness to a Sn:Pb alloy having a ratio of 1:30.

If the numbers in the Lyman chart are correct, and going by the alloy hardness equivalents provided, it would appear that the "3 parts Lyman #2 and 7 parts pure lead" would end up softer than the 1:30 Sn:Pb  hardness.
Is this correct?

There at least 2 mixes for #2, the later one is the one that I used, back in the 80's and early 90's for CBA matches.

That formula is 5% tin/95% WW (about 2% short on antimony). the original formula is 90% lead, 5% tin and 5% antimony. Lyman also gives 2 other formulas that mix lead, 50/50 solder, lino and WW's, to give appox #2.

Frank

The chart shown in the #38 manual is using the 90-5-5 formula for #2 alloy as its basis for the equivalent hardness values given.
  
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calledflyer
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Re: Alloy Percentages
Reply #93 - Mar 2nd, 2019 at 6:14pm
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As the very wise Mr. Fergueson said, 'depends'.  Wink
  
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SgtDog0311
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Re: Alloy Percentages
Reply #94 - Mar 3rd, 2019 at 1:03pm
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gunlaker wrote on Feb 25th, 2019 at 7:49pm:
John I think the black powder really seems to bump them up hard, well into the nose.  At least in the .40 & .45 cals.  I have a recovered Lyman Snover in .40 cal that a friend gave me.  It was cast in 20:1 and I'd say the majority of the nose shows deep engagement of the rifling.   I've heard that smokeless won't do that, but I haven't seen the same bullet shot with both powders so don't really know.

Chris.


I can attest to BP velocity (reduced) Smokeless loads, at least 4198 and 4759, not bumping up anything like BP.    Fireforming odd ball cases will sure prove that out.    Maybe with fast pistol powders but I don’t use those in my vintage guns.
  
Best Regards,
John
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