Just bought a 300 RUM in Rem 700 BBL. Plans are to shoot 220 SMK long range and 200 AB for hunting. Found a lot of load data on the 200 AB and just a little on the 220 SMK bullet for shooting long range. Many shooters shoot the 220 SMK at all? After barrel is gone I am building a 338 EDGE on the action but for now look forward to shooting the 300.