577-450 assortment - General Ammunition Collector Discussion - International Ammunition Association Web Forum
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577/450 Martini Henry Manufacturer? - General Ammunition Discussion - International Ammunition Association Web Forum
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Martini Henry Precision turned cases, The .577/450 Martini-Henry is a black powder, centrefire rifle
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File:577 450 Martini-Henry Great Britain Royal-Laboratories-MkIII-410gn-bullet.jpg - Wikimedia Commons
![Forming & Trimming The 577/450 Martini Henry Case from 24 Gauge Shotgun Shells (First Attempt) - YouTube Forming & Trimming The 577/450 Martini Henry Case from 24 Gauge Shotgun Shells (First Attempt) - YouTube](https://i.ytimg.com/vi/eaJSTPVVOjA/maxresdefault.jpg)