Another thing to keep in mind when you are using $130, et al, that you set $20=1. This enables soft limits. The board will drive your cutting head as far as it will go unless you have $20 enabled.
$130, $131, $132 – [X,Y,Z] Max travel, mm
This sets the maximum travel from end to end for each axis in mm. This is only useful if you have soft limits (and homing) enabled, as this is only used by Grbl's soft limit feature to check if you have exceeded your machine limits with a motion command.