I only have the 270. I have looked at getting a 50 cal barrel but have yet to do it, its hard to spend another 500 bucks for the barrel and scope for 2 weeks of hunting. Take down and change is easy though. just a screw and a pin. As for the accuracy issue, these guns are like any other, they will like some ammo better than others, luckily mine likes the cheap stuff. I tried regular Hornady 130 grain ammo and shot 3-4 inch groups. The superformance shot the same way. In canada it did group some noslers at sub 1". No rifle is going to like everything it gets fed though.