As nothing can be truly perfect, the closest you will come is with a roller. However, as you don't have one, Rich's method is about as easy as it gets without building a special jig. Using a bending fork, you could do them cold from the start. You will get slight flat spots at the bends but these will come out when you hammer them round. I have made circles and half circles of several sizes up to 31" diameter using similar methods. You haven't told us what the rings' purpose is. How "perfect" do they need to be? Do they need to be visually perfect or do they need to have mechanical accuracy?
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