If Vic actually wanted to kill Batman He would have done it a long time ago.
Mr Freeze's device has a hypersonic wide angle beam [faster than Mach 5 but not faster than light]. His handheld device may be shaped like a gun. But it sure as hell is not limited to producing shells and straight line energy projection.
Mr Freeze 10/10.
Freeze holds logan in solidice -omega red style- at a temperature near absolute zero, And leaves a minion to shatter it -Gotham Central- style into a million pieces.
The skeleton will make a nice coat hanger.