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Thread: Measuring & Using Specific Gravities of Lead Alloys

  1. 07-27-2014, 12:54 PM #1
    texasmac
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    Measuring & Using Specific Gravities of Lead Alloys

    If you’ve ever wondered about the purity of the lead/tin casting alloy you’ve mixed or purchased, there is a relatively simple process to determine the percentages. But first, using a good reloading scale, you must determine the specific gravity (SG) of the alloy. I recently received permission from SPG®, Inc. to post, on my website, an article I authored on the subject. It was published in the Summer 2014 edition (Issue #86) of the Black Powder Cartridge magazine. Following is the link to the article titled, Measuring & Using Specific Gravities of Lead Alloys: http://www.texas-mac.com/Measuring_a...ad_Alloys.html.

    Wayne
    NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF member, Author/Publisher of the Browning BPCR book.
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  2. 07-27-2014, 02:17 PM #2
    el34
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    Good article, easy to set up. I had a bunch of solder given to me but no indication of Sn/Pb ratio so I measured density using water displacement to weight. That science class comes in handy!
    "The urge to save humanity is almost always a false front for the urge to rule." --H. L. Menchen
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  3. 07-28-2014, 12:16 AM #3
    johnnysespresso
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    texasmac, a great big thank you for that link. There is a link in that story to an article on specific gravity of lead-tin-antimony alloys.
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check