The Savage/ Stevens has a ton of parts to mod into what you want. There are a couple of good triggers, lots of stocks, bolts and bolt heads, SS trigger guards, ect. The Savage is a proven design, "50 years old". Will the Marlin bolt action be around in 5? Time will tell. It may be a great gun, "Savage copy", but only time will tell. Yes the 6br is a more efficient case. Yes, in a br gun it is more accurate, tho I doubt you could tell w/o a custom heavy barrel. You can always load down the 243 and 7-08, say 200 fps and get better case life, but factory is not bad. If you really want a live forever barrel and case, check out the 30br. I am just trying to let you know that even though the 6br is a great great round, do a little math and compare the cost of the 6br dies and custom barrel compared to the powder you save and you are looking at a ton of rounds before you will see break even. Powder is the second cheapest thing in hand loading after primers. Now if your set on the wildcat just cause you want one, then good for you because alot of us, myself included enjoy them. I would suggest going to the Savage shooters forum and looking for one of their vendors "Northlander" and have him order you a 6br barrel in your choice of SS or chromemoly of your choice and contour in a 6br from McGowen and you will be set. I have ordered 2 barrels from him and he is good people.