You can use Trail Boss. Hodgdon has instructions on how to figure a load.
Load a dummy round. use a bullet to find where the bottom of the seated bullet is make a line. Line another case with it. Make a line on the new case. This is where the max load will go to. Fill the case to the line. Weigh the charge. This is max load. Reduce to 70% of max. This is the starting load.
Note it will not give high velocity. Though it does give consitent velcoties when charged by volume. It is all I use for cast lead in .38 spcl.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.