This is just a bullets on table scene rendered using Cycles with HDRI light
Very nice detailed model, and render! I would only cut back on the DOF a little bit, a little too much for my taste, but easily fixed.
In terms of scene composition use of DOF should indicate what part of the scene should "draw" the users attention. The objects in focus indicate importance, however there is only one bullet in focus and I feel like it is not any less relevant then the other identical bullets. Maybe drop the blur some and split the primary focus between the front three bullets. The bullets in the background could remain blurry because they are less relevant then the bullets front and center. Just my thoughts, it is your creation. As for the rest of it, the details on the model is amazing, as well as your material work. Well Done!
Very nice, well done!