Been hand loading for 27 years but .38 is the least round I load for.
Just start at a lower powder grains and work up from there, always mindful of over pressure on the brass.
Go with the most accurate load. Use your chrono and do a ladder test. That will help you find the sweet spot load.
Use the same primers as that can make a difference.
Then stick with it.
Need to get one, the old one crapped out and I just have y standard loads so I haven't got another.
Ditto!!! That’s best method I see to use.