I have an opportunity to purchase a Stevens 200 in 308 for 200 dollars. Since I own 4 308's currently, I am not interested in another in that caliber. So the question is can I go to Midway or Savage-Barrels.com and purchase a drop in Savage barrel in 260 rem and drop it into the Stevens stock? The way I figure it that would amount to about 400 in a new rifle. If this would work, are there any suggestions about the length, contour and twist I should order for the barrel.? Application is 90lb whitetails in Texas Hill country at 500 yds. Thanks for the help.