\documentclass[twocolumn,twoside]{report}
\usepackage{gcheck}

\usepackage[reset]{geometry}
\geometry{width=600pt,left=2cm,right=1cm}
\geometry{dvips,showframe, columnsep=20pt}

\begin{document}

\typeout{}
\dcheck\paperwidth{614.295pt}
\dcheck\paperheight{794.96999pt}
\dcheck\textwidth{528.93675pt}
\dcheck\textheight{556.47656pt}
\dcheck\oddsidemargin{-15.36449pt}
\dcheck\evensidemargin{-43.81725pt}
\dcheck\topmargin{-13.87262pt}
\dcheck\headheight{12pt}
\dcheck\headsep{25pt}
\dcheck\footskip{30pt}
\dcheck\marginparwidth{48pt}
\dcheck\marginparsep{10pt}
\dcheck\columnsep{20pt}
\dcheck\hoffset{0pt}
\dcheck\voffset{0pt}
\ccheck\mag{1000}
\checkresults
\typeout{}

\manyfoxes\manyfoxes\manyfoxes\manyfoxes
\manyfoxes\manyfoxes\manyfoxes\manyfoxes
\end{document}
