"Since your a veteran collector whats your most unique cartridge in your collection?"
Couple of qualifiers...
.32 Moore teatfire, the early flat teat
.54 Gallagher Carbine cartridge
A bunch of the British African cartridges...
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.