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			The needle  gun (Dreyse needle  gun) cartridge makes sense.  A  quick  check of  Wikipedia  shows a cartridge  diagram that  doesn't  quite match  up to what  you  have, Skeet.  They say  the Dreyse used a .61  caliber  bullet,  and a paper cartridge that was  rolled and  tied  at the 'upper'  end (their words).  I'm  guessing the 'upper  end' was the  bullet  end.They also describe the  bullet  as  being acorn shaped,  rounded at  both ends-  not a  concave  base.
 Still,  that paper tube  looks  too thick  for a Sharps  to shear  off, as  the non cartridge Sharps  rifles  did.  The cartridge  doesn't  look like a  Maynard, Burnside or Spencer cartridge, either. BTW, the Spencer was designed around a  rimfire case from the start- the Spencer never used a paper cartridge.
 A needle  gun cartridge seems  the  best  guess,  but I'm  still scratching my  head. . .
 
				__________________“May we never confuse honest dissent with disloyal subversion.”
 Dwight D. Eisenhower
 "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter"
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 Jack@huntchat.com
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