▁▁ 7 . 9 mm K , ▁or ▁ 8 × 3 3 ▁Pol te . ▁It ▁was ▁specifically ▁intended ▁for ▁development ▁of ▁the ▁St urm ge wehr ▁ 4 4 ▁( ass ault ▁rif le ). ▁The ▁round ▁was ▁developed ▁as ▁a ▁comprom ise ▁between ▁the ▁longer ▁ 7 . 9 2 × 5 7 mm ▁rif le ▁and ▁the ▁ 9 × 1 9 mm ▁Par ab ell um ▁p istol ▁r ounds , ▁and ▁is ▁known ▁as ▁an ▁intermediate ▁cart ridge ▁( ). ▁ ▁Cart ridge ▁dimensions ▁The ▁ 7 . 9 2 × 3 3 mm ▁Kurz ▁has ▁a ▁ 2 . 2 2 ▁m l ▁( 3 4 . 3 ▁gra in ▁H 2 O ) ▁cart ridge ▁case ▁capacity . ▁The ▁exterior ▁shape ▁of ▁the ▁case ▁was ▁designed ▁to ▁promote ▁reliable ▁case ▁feed ing ▁and ▁extra ction ▁in ▁assault ▁rif les ▁under ▁extreme ▁conditions . ▁▁ 7 . 9 2 × 3 3 mm ▁Kurz ▁maximum ▁C . I . P . ▁cart ridge ▁dimensions . ▁All ▁sizes ▁in ▁mill im eters ▁( mm ). ▁ ▁Americans ▁define ▁the ▁shoulder ▁angle ▁at ▁alpha / 2 ▁ ≈ ▁ 1 7 . 5 ▁degrees . ▁The ▁common ▁rif ling ▁tw ist ▁rate ▁for ▁this ▁cart ridge ▁is ▁ 2 4 0   mm ▁( 1 ▁in ▁ 9 . 4 5 ▁in ), ▁four ▁gro ov es , ▁ Ø ▁lands ▁= ▁, ▁ Ø ▁gro ov es ▁= ▁, ▁land ▁width ▁= ▁ ▁and ▁the ▁primer ▁type