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What is this for a Cartridge ?

Maybe a safing pin/plug from a fuze that is ejected upon firing. Akin to the 3.5" bazooka round.
 
The fuze(M404) on the 3.5" rocket is not electric. The correct nomenclature for the "safing pin", I've found, is -ejection pin. A spring loaded pin that blocks the fining pin. Which is ejected on firing. While the pictured item is not from that particular fuze, it resembles something similar, hence, my guess.
 
I believe Slick is describing what we always referred to as the "Bore-riding pin" which as Slick says, is a spring-loaded safety pin released by set-back or acceleration upon firing and then "rides the bore" to the muzzle where it is ejected as the round leaves the tube.
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