▁No ▁ 2 ▁Gib bs ▁ 2 ▁ ¾ ▁in ch , ▁was ▁based ▁on ▁the ▁No ▁ 1 ▁cart ridge ▁case ▁with ▁a ▁length ened ▁neck . ▁ ▁It ▁fired ▁either ▁a ▁ ▁or ▁a ▁ ▁bullet ▁driven ▁by ▁ 9 0 ▁gr ▁of ▁pow der . ▁ ▁History ▁Both ▁cart rid ges ▁were ▁developed ▁by ▁Br istol ▁gun maker ▁George ▁Gib bs ▁for ▁use ▁in ▁his ▁Gib bs – F arqu har son – Met ford ▁single ▁shot ▁rif les ▁built ▁on ▁the ▁Far qu har son ▁falling ▁block ▁action , ▁although ▁Gib bs ▁also ▁built ▁double ▁rif les ▁with ▁Met ford ▁bar rel s ▁chamber ing ▁these ▁cart rid ges . ▁ ▁The ▁. 4 6 1 ▁No ▁ 1 ▁Gib bs ▁was ▁designed ▁around ▁ 1 8 7 9 – 8 0 , ▁whilst ▁the ▁. 4 6 1 ▁No ▁ 2 ▁Gib bs ▁was ▁designed ▁around ▁ 1 8 9 0 . ▁ ▁Both ▁cart rid ges ▁were ▁subsequently ▁loaded ▁with ▁m ild ▁load ings ▁of ▁sm ok eless ▁cord ite , ▁carefully ▁bal anced ▁to ▁rep licate ▁the ▁ball istics ▁of ▁the ▁original ▁black ▁pow der ▁versions , ▁to ▁become ▁the ▁. 4 6 1 ▁No ▁ 1 ▁Gib bs ▁N it ro ▁for ▁Black ▁and ▁the ▁. 4 6 1 ▁No ▁ 2 ▁Gib bs ▁N it ro ▁for ▁Black , ▁but ▁unlike ▁other ▁similar ▁black ▁pow der ▁cart rid ges ▁of ▁their ▁era , ▁neither ▁became ▁a ▁N it ro ▁Express ▁cart rid ges .