▁the ▁bullet , ▁se ated ▁into ▁the ▁br ass ▁cas ing . ▁Cart ridge ▁overall ▁length , ▁or ▁" COL ", ▁is ▁important ▁to ▁safe ▁function ing ▁of ▁re loads ▁in ▁fire ar ms . ▁ ▁Hand loaded ▁cart rid ges ▁and ▁commer cially ▁available ▁cart rid ges ▁for ▁fire ar ms ▁are ▁normally ▁created ▁with ▁a ▁maximum ▁length ▁standard ized ▁by ▁the ▁Sport ing ▁Ar ms ▁and ▁Am mun ition ▁Man ufact ur ers ' ▁Institute ▁( SA AM I ). ▁ ▁A ▁cart ridge ' s ▁overall ▁length ▁may ▁be ▁shorter ▁than ▁the ▁maximum ▁standard , ▁equal ▁to ▁the ▁standard , ▁or ▁sometimes ▁even ▁longer . ▁ ▁The ▁maximum ▁overall ▁length ▁is ▁dict ated ▁by ▁the ▁need ▁to ▁fit ▁into ▁a ▁box ▁magazine ▁of ▁standard ▁manufact ure . ▁ ▁For ▁example , ▁the ▁. 2 2 3 ▁Rem ington ▁cart ridge , ▁when ▁loaded ▁for ▁use ▁in ▁the ▁AR - 1 5 ▁rif le ▁( or ▁the ▁military ' s ▁M 1 6 ▁rif le ), ▁has ▁to ▁fit ▁into ▁the ▁remov able ▁box ▁magazine ▁for ▁that ▁rif le . ▁ ▁This ▁dict ates ▁that ▁the ▁cart ridge ' s ▁maximum ▁overall ▁length ▁be ▁no ▁greater ▁than ▁ 2 . 2 6 0 ". ▁ ▁However , ▁for ▁competition ▁purposes ▁during ▁off - hand ▁and ▁slow ▁fire ▁pr one ▁match ▁stages , ▁the ▁. 2 2 3 ▁Rem ington ▁is ▁loaded ▁one ▁cart ridge ▁at ▁a ▁time ▁into ▁the ▁rif le ' s ▁receiver . ▁ ▁This ▁allows ▁for ▁the ▁cart