Magnum

Long Day's Journey into Night is considered to be Eugene O'Neill's magnum opus.

This is probably Tom's magnum opus.

So please don’t ask me when / There may be wine and roses / And magnums of champagne

I know what you're thinking. "Did he fire six shots or only five?" Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But, being as this is a .44 magnum, the most powerful handgun in the world, and would blow your head clean off, you've got to ask yourself one question: "Do I feel lucky?" Well, do ya, punk?