When using any form of symmetry, you need to apply only the load that acts on the section of the part that you're actually analysing.
You're applying the full 825 000 lbf to a small fraction of the rod (although it looks wider than 3.6°... is it 36°?). You should divide the load by the same fraction that you've divided the rod, which will reduce the stress in direct proportion. To put that another way, if you're analysing half the rod you should apply half the total load; a quarter of the rod, apply a quarter of the total load; a tenth, a tenth of the load; and so on.
Also, you've used the 'smooth' stress display, and you're not showing element edges. Turning off 'smooth' and showing the element edges in areas of high stress gradient will help you to visually check the convergence, and therefore whether you need to refine the mesh.
As Chris said though, this can only give you an approximation to the real stresses...