If your looking for the flattest shooting rifle for medium sized game you might take a look at two Remington produce, the 7mm STW and the 7mm Ultra-mag. These two ultra-flat shooting cartridges simply out perform most everything on the market and don't cost an arm and a leg to get into.
If your looking for a rifle that is easy and inexpensive to change barrels on check out the Savages's. With a barrel wrench, a barrel vice and a headspace go gauge (available as a kit from Midway) it takes about fifteen minutes to change out a barrel and you can do it yourself.
