The Rum has about 6gr more powder capacity compared to the 338 Sin. The 338 Sin has 13grs more powder capacity then the 330 Dakota, The 338 Sin has about 5grs more powder capacity then the 340 weatherby. So you can see where the 338 Sin falls in comparison. It will shoot right with the edge/rum and be a repeater on any std long action with a magnum bolt face and the availability of the Norma brass is a plus over the edge.