Density Changes in loads

[Fishh2o]

When going from a less dense material like HS 15g/cc to a more dense material like TSS. As long as I keep a 1 oz load a 1 oz load besides the difference in shot column height what are people seeing in data? So if a HS 15g/cc load is 1400FPS and 10,000 PSI will the density change cause a rise in pressure or lower the pressure and velocity? Assuming all components are the same.

[hawglips]

When going from a less dense material like HS 15g/cc to a more dense material like TSS. As long as I keep a 1 oz load a 1 oz load besides the difference in shot column height what are people seeing in data? So if a HS 15g/cc load is 1400FPS and 10,000 PSI will the density change cause a rise in pressure or lower the pressure and velocity? Assuming all components are the same.

The rule of thumb is this. If you go from 15g to 18g, and keep all else the same, the PSI will go down some, but velocity should remain about the same. But you'll have excess room in the wad column to fill with something also. If you put more cushion under the shot, PSI and MV both will go down some more.

The opposite occurs when you go from denser to lighter shot. PSI goes up rapidly in that scenario.