No, the phrase comes from the 1973 flick "Magnum Force" and Dirty Harry's "influence" on the lives (no pun intended) of vigilante evildoers.  In form, it is used three times in the movie, the most memorable being the ultimate line of dialogue. 

 

Grayhawk, this sounds like important communal knowledge.  How about posting "Magnum Force" on the website?

 

Colyn