After spending some time looking over what is available, legendary wise is the New Iron Banner scout Rifle Colovance's Duty. It has the longest base range and has a good section of stuff it might come with that might max out said range. Its rate of fire and stability is worse than the Rapier's but that was pretty much always the case. Second best would be the SUROS DIS-43 I have had some time with a good rolled one ( lucky me) and while its base range is not as good as Colovance's it is close to it and has some good perks that can make it pretty good and its magazine size can be nothing to sneer at ( mine came out to like 23 with a one of the perks.) Over all these two beat out even the exotics barring Fate of All Fools and The Jade Rabbit for range at least which is what I tend to go by.