SAECO To Brinell Hardness Conversion Table - Cast Bullets For Beginner And Expert

A collection of comments and articles on the many aspects of bullet casting by various cast bullet shooters

Cast Bullets For Beginner And Expert

SECOND EDITION, 2007 - Joe Brennan

SAECO To Brinell Hardness Conversion Table

This is a representation of the chart that Saeco ships with their Bullet Hardness Tester.

The chart demonstrates the relative hardness that may be expected when alloying various ratios of Tin/Lead by using the following formula.

BH = ( 222.5 x R - 7.82 x R x R ) / ( 1 + 23.12 x R ) + 5

Let "R" equal a Ratio which is the weight of the Tin in the alloy divided by the total weight of the alloy.-

Then:

1 part tin plus 19 parts lead (by weight) equals a 1 in 20 alloy.

Then 1/20 = 0.05 ... So then R = 0.05..... Therefore:

BHN = ( 222.5 x 0.05 - 7.82 x 0.05 x 0.05 ) / ( 1 + 23.12 x 0.05 ) + 5

The Brinell Hardness Number of a 1 in 20 Tin-Lead alloy = 10.15

Warning: All technical data mentioned, especially handloading and bullet casting, reflect the limited experience of individuals using specific tools, products, equipment and components under specific conditions and circumstances not necessarily reported in the article or on this web site and over which The Los Angeles Silhouette Club (LASC), this web site or the author has no control. The above has no control over the condition of your firearms or your methods, components, tools, techniques or circumstances and disclaims all and any responsibility for any person using any data mentioned.

Always consult recognized reloading manuals.