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Other explosives used in primers can include lead azide, potassium perchlorate, or diazodinitrophenol (DDNP). New on the market in the late 1990s are lead-free primers(see green bullet), to address concerns over the lead and other heavy-metal compounds found in older primers. The heavy metals, while small in quantity, are released in the form of a very fine soot. Some indoor firing ranges are moving to ban primers containing heavy metals due to their toxicity. Lead-free primers were originally less sensitive and had a greater moisture sensitivity and correspondingly shorter shelf life than normal noncorrosive primers.[citation needed] Since their introduction, lead-free primers have become better in their performance compared to early lead free primers, as reported by AccurateShooter.com in October 2011. Tests comparing lead-free primers to lead-based primers conducted by the US Department of Defense (approx 2006), exposed some significant differences in accuracy between the two primers when used in 7.62×51mm. In these tests, lead-free primers were proven to be not as accurate as lead-based primers. The lead-free primers exhibited poor performance as far as peak blast pressure, which consequently leads to poor ignition. Popularity is still minimal, as accuracy is paramount. Most lead-free primers are sourced through Russia (MUrom?)or South Korea (PMC).
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发表于 2018-2-3 17:32
