Military corrosive ammunition dating jeff prost dating
The problem may be more serious with brass cartridge cases, which are much thinner than a brass ship’s bell.Brass cartridge cases are an alloy of about 70 percent copper and 30 percent zinc.However, a generous quantity of liquid media should provide enough dilution to carry away the salts and work quickly enough to prevent dezincification.Still, if you don’t like the idea, you might clean in a dry media tumbler those fired cases that had been loaded with corrosive chlorate primers. Theories aside, the reality is that I’ve never heard of any documented failures of cases previously fired with chlorate primers that had been cleaned by either dry or wet methods – that is, failures inarguably attributable to chlorate primers—so reloading such cases after cleaning is apparently a nonissue in that regard.The Ammo Encyclopedia (6th Edition, 2017, Michael Bussard) has information slightly differing from Harrison’s, stating Frankford Arsenal utilized chlorate primers “until the mid-1950s.” Another researcher has done us a service in publishing a paper that specifically identifies noncorrosive US manufactured military ammunition from WWII to 2001, including .30-06, 45 ACP and 7.62 NATO, by lot number and date; a free, downloadable PDF is online at: odcmp.org/1101/
” Most recently, the question posed to me was in regards specifically to military surplus M2 Ball .30-06 brass.
The salt is hygroscopic – that is, it quickly attracts and holds moisture against the metal of the bore, corroding it; obviously it is a more serious problem in humid climates than arid environments.
Since salt dissolves in water, cleaning the bore with water removes the chloride.
Because of the potential for case failures, firearms authorities have long advised against reloading cases that originally fired mercuric primers, even though reloading them was a practice of necessity for many in the early days of metallic cartridges.
By 1900 the US military changed from mercuric primers to the Next Big Thing – potassium chlorate primers.