Report viewer dynamic graph limits

Report designer:
I would like to set the graph range axis min and max values to a dynamic property.

The FactoryPMI manual states “Leave blank for automatic, or specify a range like 0,100”.

I have a series where I would like to set the limits to 7.4 to 7.8. If I leave it blank for automatic I get limits of 0 to 8. I cannot hard code the values because the series range values change from order to order.

Thank you,