Glass bullets

Taofledermaus:

A test of 2 borosilicate glass (aka Pyrex) slugs that were custom made. Borosilicate glass is a type of glass that includes at least 5% boric oxide. The boric oxide makes the glass resistant to extreme temperatures, and also improves its resistance to chemical corrosion. This glass is very popular in the manufacture of scientific instruments, and it was once widely used to make glass for kitchens as well.

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