I'm setting up a Remington 700 in 7mm Rem Mag for elk and mulie hunting in Colorado. I'll be limiting myself to an absolute max of 400 yards with this gun on either animal. What would be a good maximum power on a scope for hunting of elk and mule deer out to 400 yards? Would the tried and true 3-9x be adequate or is a 12x or 14x called for? If I throw antelope hunts with the same rifle into the equation does that alter your scope choice? For the time being,I won't be buying another gun for antelope, although I'd like to get something fun in the future for really long shots on them.