My 38 special target loads cost about 4 cents for primer and powder. To this add whatever the cost is for your bullets ( you already have the brass ) and compare that with the cost of factory ammunition. Divide the difference into the cost of the reloading equipment and you know the breakeven point. You will probably break even between 1000 and 2000 rounds which, for you, is in around 4 months. Using a single stage press you can load about 100 rounds an hour. Thus it will take you about 2-3 hours a week to feed your habit.

Enjoy your new hobby.