I have an R700 LA with magnum bolt face. I have an hs precision stock for it. I want this gun to be for longer range deer hunting. I am not a 1k yard shooter and dont plan to be but I was wondering what is the smallest magnum cartridge you would put in a long action? I'd like to go smaller than 7mm and wish the 243 wssm would work but with my little knowledge on this stuff I was hoping you guys could give me some insight. Thanks in advance.