I asked this question on the gunsmithing forum with no answers. I'm wondering what it takes to turn a rifle chambered in .300win to a .300ultra? As far as I can tell they both use the same twist in barrels and both use magnum sized actions. So my guess is other than getting it reamed to the new cartridge you'd need to open up the magazine and do some work with the feed rails? Please help with what needs to be done and what am I looking at for price. Question is if you had a .300win mag that shot great would you make the change? I've got a few .300win's and want something different.