hey guys I just ordered a Remington 700 SPS tactical in .223 so that I can start working on more accurate shooting and my ability to shoot well. I really like the remington 700's and the SPS tactical seemed to be a pretty good gun for the price minus the stock. What I'm trying to find out, and forgive me if this is a stupid question, good ammo to shoot through it and it's compatibility with 5.56. I understand the difference between the .223 and the 5.56 but I was reading the other day about the potential compatibility between the .223 rifles and a 5.56 round. I didn't really understand what was being said though... I think it was talking about the neck or something slightly longer on the 5.56 and something about where the bullet slides into the barrel needing to be a certain depth in order for it to fit without causing jamming or other problems. Like I said noob question! but any advice on this would be great. Please educate me 
