You have some control here. You can shrink the parts 7% and get about 80-85% density. If you add enough heat and time for the parts to shrink by 20%, your density will be in the low 90’s. The less they shrink, the less the shape will change. The X and Y axes shrink fairly uniformly. The Z axis will have slightly more shrink due to gravity. Circles and holes keep their shape well. A good rule of thumb when starting is out is 5% isostatic shrink for Copper and Bronze, 10% isostatic shrink for the steels.