I have a 10 year old model 700 w/ stainless barrel,synthetic stock,factory detachable magazine. In 7mm rem mag. I am wondering if I can use this action for a .338 lapua? I will be ordering a Manners MCS GAT stock (thumbhole), and I will be putting a Lilja stainless barrel on it (not sure on what size)? And will be using a Patriot arms fat bastard muzzle break. Will I be able to use the detachable magazine with this caliber? I will be using my busnhell 6500 4.5-30X 50mm scope on it. I plan on getting a local gunsmith to put it together for me and I will bed it myself. Is there any concerns or things that you guys can reccomend this is my dream build and I will be shooting this gun for a long time! It is gonna be used for long range hunting where alot of glassing is required so weight isn't that big of a deal.