A friend of mine has fallen on some hard times. He is offering to sell several rifles. The one I am most interested in is a model 700 mountain SS 308. While I do like this rifle is there any difference in this and a 700 sps with a bell and Carlson stock added to it? Any help from those with experience on these two would be helpful. I am not looking for any kind of long range performance from this. Longest area id take this to would be 250-300 yards.