I have seen on here that some people don't use magnum primers for the 7mm RM. Is this pretty typical? Would LR primers work better for RL22, H1000, and Retumbo? I have Federal LR Match and Federal LR primers. As far as Mag primers I have CCI 250, and Winchester Magnum Rifle. What should I go with? Also, what is the difference between the LR and LR Match primers? Any info would be a great help.