To expand on Tony's last comment: Colin's blank is "Boxer" primed while all other examples here, are"Berdan" primed. The Berdan primer is a bigger dia.
FYI. Boxer primers in .303 (post war, commercial?)are generally non corrosive while the Berdan primers of WWII were corrosive.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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