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Old October 4, 2012, 06:11 PM   #4
Senior Member
Join Date: October 18, 2006
Posts: 6,223
Put one bullet in saltwater for a week, if the jacket rusts it is iron, if not it is likely a cupro-nickel alloy. Nickel content over 50% is enough to attract a magnet.

I wouldn't worry too much about a thousand rounds through a 45. A lot of those GI 1911's had barrels last a very long time.

Machine guns are awesome until you have to carry one.
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