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Add ZoomMode="PageWidth" and SizeToReportContent="True" attributes to ReportViewer control in /MvcReportViewer.aspx page.
<rsweb:ReportViewer ID="ReportViewer" runat="server" Width="100%" Height="100%" ZoomMode="PageWidth" SizeToReportContent="True"></rsweb:ReportViewer>
You can also find browsers compatibility information on http://msdn.microsoft.com/en-us/library/ms156511.aspx