I am think about building a 243WSM for a coyote killin machine. Plan on gettin a Savage action and going from there. I would like to shoot 55 grainers. Suppose to be BLISTERING fast!!! Just wondering if anyone has one and what they think about it? Also does any of the factory gun companys make them or they just a build it yourselfer? One other question, I want a rifle with a medium varmit contour similar to the Savage predator. Like a 20 or 22in. medium heavy barrel. Trying to keep it packable. What brand of barrel would y'all reccommend? Thanks for any help!!!