If you have a recent Speer manual read the section on pressure. There
is a good explanation of why you can't read pressures of low power
handgun cartridges by visual indicators. Some primers are softer than
others and may show cratering at normal magnum handgun pressure
levels and do not indicate excessive pressure. The advice to "work up
slowly while watching carefully for signs of excessive pressure" gets
repeated endlessly when working with cartridges that operate at
15,000 psi or so and is meaningless. Sticking to published data is the
best way to avoid trouble unless you feel like you have enough
experience to work up safe loads.