I'm currently getting into long range shooting. I have a Sps tactical 308 in a BC medalist stock and a Remington Sendero sf2 in 300 winmag. I want to start shooting some 600 and 1000 yard competitions. I currently have 500rds of 308, would it be better to just shoot the barrel out of the 308 and rebarrel it to a 6.5cm, or sell the 300 and buy a 6.5? Or just keep what I have and shoot them.