Ever since I started playing on this server, I have never understood why people think that Bombers should be able to compete with Fighters when it comes to protecting themselves or other ships from anything smaller than a gunboat.
The fact that currently bombers can win against a fighter if they are skilled enough is fine as it is, in my opinon at least. Scatters were so horribly unbalanced before that many of the good pvpers started actually flying bombers instead of fighters just because they are so versatile and could do anything that a fighter could, and more. This is no longer the case because of the SNAC and Scattergun nerf, and I think it is fine as it is.
Bombers are already very painful to kill for fighters (if it runs and is not something like a Waran that is 2 million meters long and has the shape of a brick) because they have so much more base-hull and an absurd amount of Regenerations that fighters, especially ones unexperienced in groupfights with mediocre or bad aim, can basically not chew through.
450m range would just make Scatterguns broken again. Not because they can delete Gunboats as easily as before, but because 450m is the range that most Fighter duels happen at. If you watch the top notch pvpers fight, you won't see many, if any, shots flying right after they turn ( at which point the distance between them is the highest) because they would just waste energy, and instead they start firing on each other when they get closer.
TL;DR: Keep it as is, Bombers should not be able to fight a Fighter : )