Tungsten barrels are always made of tungsten heavy alloy, 80~95%W with binders (Ni, Cu, Fe) of various composition.
Meanwhile, we also supply barrels of tungsten lower than 80% by weight, and the binder would be copper only. However, such barrels would be finished with copper-looking rather than tungsten-looking.
Barrels are available in four basic shapes:
c) torpedo – maximum width where barrel meets the point
d) bomb – similar to the torpedo shape but maximum width slightly further back