▁( bin oc ular s , ▁per is cop es ▁and ▁others ) ▁for ▁the ▁crew . ▁The ▁low ▁m uzz le ▁velocity ▁( around ▁ 4 5 0   m / s ) ▁meant ▁a ▁relative ▁short ▁range , ▁ 9 , 5 0 0   m ▁at ▁best ▁elev ation ▁of ▁ 4 5 ▁degrees , ▁but ▁the ▁installation ▁allowed ▁only ▁ 2 2 ° ▁and ▁so ▁the ▁range ▁was ▁limited ▁to ▁around ▁ 7 – 8   km . ▁The ▁range ▁in ▁direct ▁fire ▁mode ▁was ▁also ▁limited , ▁especially ▁against ▁moving ▁targets , ▁for ▁the ▁same ▁reason . ▁Only ▁one ▁roof - mount ed ▁machine ▁gun ▁was ▁fitted ▁for ▁close ▁defence , ▁though ▁sometimes ▁it ▁was ▁omitted . ▁Initial ly ▁this ▁was ▁a ▁ 6 . 5   mm ▁B red a , ▁later ▁upgrad ed ▁to ▁an ▁ 8   mm ▁model . ▁Am mun ition ▁load ▁was ▁typically ▁ 4 4 ▁ 7 5   mm ▁shell s ▁and ▁ 1 , 1 0 8 ▁ 8   mm ▁cart rid ges , ▁quite ▁low ▁by ▁contemporary ▁self - prop elled ▁gun ▁standards — even ▁though ▁in ▁the ▁North ▁African ▁theatre ▁some ▁cre ws ▁used ▁to ▁store ▁some ▁ 1 0 0 ▁shell s ▁by ▁removing ▁their ▁seats ▁and ▁filling ▁the ▁space ▁with ▁the ▁extra ▁r ounds . ▁A ▁model ▁R F 1 ▁CA ▁with ▁inter phone ▁radio ▁was ▁usually ▁fitted . ▁ ▁Service ▁Although ▁these ▁machines ▁were ▁not ▁widely ▁known , ▁the ▁vehicle ▁performed ▁well ▁in