Ever since Remington one exclusive rights to load Hevi-shot the other manufacturers have been doing the simple solution to copyright infringement.....change the stuff just enough so as not to be "technically" the same. I believe Federal also loads some kind of Tungstenblablabla stuff too. Just add one different element and youve got a "new" metal thats still basically the same. Of course Im no metallurgist, so I cant say exactly whats different :grin: .
Brian M.