Have a look in
www.hartzellprop.com
or google "Repair metal propellers" which will give you a direct run to the right spot on the Hartzell site.
The good news is that they are talking about 3/16" as a maximum allowable nick which can be dressed out, so you should be in with a chance.
The bad news is that the permitted allowances (depth and location) on the actual prop concerned will have to be checked and then dressed out by a and signed off by a competent person