As oil rallies toward $50, traders taking profits

Nicky Loh | Bloomberg | Getty Images

After a pause to start the month, this week U.S. crude oil prices have resumed their monster rally from $27 a barrel, which began in February, putting $50 within striking distance.

Will the half-century mark, which stymied crude last year, put an end to this epic comeback? Most traders, especially those who make a living studying charts, seem to think it will.