Eduard Rubin
Eduard Alexander Rubin was a Swiss mechanical engineer who is most notable for having invented the full metal jacket bullet in 1882. His most famous cartridge was the 7.555mm Swiss which was the standard ammunition for the SchmidtRubin, K31 and Stgw 57 military rifles. His fully copper clad bullets were also the inspiration for the full metal jacket bullets introduced in 1886 for the Lebel rifle. He served as director of the Swiss Federal Ammunition Factory and Research Center in Thun.
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Source: Wikipedia