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I suspect the phosphorus ( sp ) is pretty hot therfore not good for a barrel....
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We 50 BMG guys burn them all the time. They cause no more barrel wear than any other bullet (at same pressure/ velocity)
I just bought 5,000 50 BMG API for 6 cents each (shipping was another 6 cents each [img]/ubbthreads/images/graemlins/frown.gif[/img] )
I'd check my page on Tracer Sources
In additon to 50 BMG they sell other mil surplus.