I'm new to this site and am looking for advise. I currently own a .308 Kimber Montanna,a .300WSM Kimber Classic and an "older" .300 Win.Mag Remington Sendero. I am interested in becoming proficient at long range hunting and am considering a Remington 40X in .300 RUM. Am I better off investing more money in the Sendero by way of truing the action,replacing the trigger and stock, etc. or should I just order the 40X ?