Hi, everyone I am new to long range shooting and want to do it right from the beginning. I have decided on getting an Accuracy International AE MK III which is a .308. I want to be able to shoot to 1000+ yard or to whatever the limits of the .308 are. I chose .308 due to is wide availability and lower cost that most other calibers. Does all of this make sense or not? Please tell me if I am totally wrong about all of this and need to go a different rout. My main question about this is my choises are a 20" braked barrel or a 24" barrel with no brake. I would like to know the advantages of both and peoples opinions at which to get. Thank you so much for your time!