Dependent on weather conditions you should get a race up to 700 miles or so, but after that it becomes more of a marathon. It depends on what you consider to be a race. Sprinting where the start and finish are essential, mid distance where you are still able to have batches arrive, distance where they are strung out a bit more, but still arriving regularly or marathon where they are extremely strung out. All are still races, but it depends on just what you are looking for in a pigeon.