Well acording to the reply to a question I asked on British Militaria Forum
Dr Rhodes. The British Soldiers Firearm, From Smoothbore to Smallbore 1850-1864
It is listed as a Cartridge containing 2.5 Drams of powder and a .60" ball
That's 70 gains of Black Powder and the .60" ball is 50 thou under bore diameter so there cartridge might have been pretty thick
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