He popped 'em with a .22 as I recall, which just rattles around inside your body and tears stuff up.
I don't know which movie it came from, but you're basically quoting something we both must have seen once where a mobster was talking about popping someone in the head with a .22 rather than a larger gun. A larger gun would make a mess, but a .22 will just rattle around and scramble the brain.
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"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars." - Martin Luther King, Jr.