Lead info

[melloroadman]

I found this info at LASC.US Lloyd .Marvin
For example, Table 5 in ASM Handbook, formerly 10th edition, Metals Handbook, Volume 2, 1998, "Nonferrous Alloys and Special-Purpose Materials".

     The theories make use of the fact that (BHN X 480) is an approximation of the tensile strength of the lead alloys in the table.

     (A regression analysis of the entries in this table for which there are both BHN and tensile strength entries yields: ksi = -.33 + .498 X BHN, with R^2 of .964. Some 96.4% of the variation in hardness is connected to the variation in BHN. The approximation using 480 is reasonable.)

[lloyd-ss]

Marvin,
That really is a good site and loaded with lots of tech articles.

http://www.lasc.us/ArticleIndex.htm

Thanks,
Lloyd

[melloroadman]

Yes it is . Here is a chart I put together . Using the multipliers given on their site that casters have used for years . They are approximate miltpliers but excepted to set guidelines for casters to work from . Please note that it takes almost 3 times the psi to obturate as it does to reach the tensile strength of lead . Some thing to consider when making a bullet skirt thin enough to obturate with out breaking . Marvin

[rsterne]

Please note that it takes almost 3 times the psi to obturate as it does to reach the tensile strength of lead .

Please explain.... Are you talking obturation on a flat based bullet?.... The situation is totally different with a hollow base or skirt.... The obturation pressure must depend on the wall thickness of the skirt.... Thanks....

Bob