If you are having trouble with enemies like Rakk Hive or The Destroyer, you are reading the right page. The simplest answer is just use a shotgun no matter how far away you are from it. The Rakk Hive and Destroyer are so big that the shotgun spread wont matter. Thats how I killed both of them. I hope this page helps!
- I hope you don't forget the shotguns tend to have slow rates of fire in comparison to other weapon types, also rocket-launchers tend to deal more damage and add a AoE to it. Also, nearly all shotguns don't have the critical hit damage increase like snipers do. So all in all, every weapon has it's up/down parts, basicly put every weapon works fine on the big catches.