I've been making Martini 577/450 brass from 24 gauge brass shotgun shells and it's going great! : r/shittyreloading

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Forming & Trimming The 577/450 Martini Henry Case from 24 Gauge Shotgun Shells (First Attempt)

File:577 450 Martini-Henry Great Britain Royal-Laboratories-MkII-480gn-bullet.jpg - Wikimedia Commons

Forming a 24 Gauge Shotshell into a 577/450 Martini Henry Case

Forming & Trimming The 577/450 Martini Henry Case from 24 Gauge Shotgun Shells (First Attempt)

Some .577/.450” Martini Henry Questions - General Ammunition Discussion - International Ammunition Association Web Forum

Reading is for squares (577/450) : r/reloading

Reading is for squares (577/450) : r/reloading

Forming 577/450 Martini-Henry Brass

Making martini Henry Brass - Crushed several cases

577/450 Martini Henry Manufacturer? - General Ammunition Discussion - International Ammunition Association Web Forum

A rare collection of .577 Snider & .577/450 Martini Henry British Service Rifle Issue Original 1800s LIVE Ammunition

Forming 577/450 Martini-Henry Brass