The chart shows how pressure drop increases as the tip size is increased. The pressure at the gun will be 1,592 psi. You'll probably notice tails in the spray pattern at this pressure. The thickness and viscosity of the material is also a major contributor to pressure drop in hoses. The pressure drop with stain is less than with block filler.
Temperatures also play an important role in material thickness and viscosity.
Just like motor oil, paint will become thicker and more viscous as the temperature is lowered. Contrary to what most people think, elevation does not have a significant effect on pressure. For an average latex paint, the pressure drop due to a 100-foot rise in elevation is only 60 psi. So, if you're having trouble atomizing a coating, the problem may be pressure drop. Connect the gauge at the pump outlet and measure the pressure while spraying or in the dynamic situation.