Values of the drag coefficient have been obtained for spheres in the region 1.5<M<3.0, 350<Re<3000 in the Pressurized Ballistics Range at the Naval Ordnance Laboratory. This region borders, on the low Reynolds number side, one investigated previously. The low Reynolds numbers were obtained by using air pressures of about 7 mm Hg and spheres as small as132in. in diameter. A contour map ofCDon Mach number and Reynolds number coordinates has been derived from the experimental data.