So I have both a 338 Rum and an Edge, to be honest both are amazing cartridges. I'm my opinion on hunting with a Rum, they truly shine in the 225 gr category, the Edge however outperforms a rum in the 250 to 300 grain weight. Even over a Lapua. Not by a lot but it does. The 300 ultra mag has more case capacity over a 338 rum, so obviously it will out run it. That is the difference between the edge and a rum, in my opinion what the 338 Rum should have been. If you want the best bang for your buck it's hard to beat a Lapua for overall performance. But if you want to kick it up a notch the edge is you bread and better. It will run a 300 gr bullet around 290-2950 on a 28in barrel, now a Rum will run a 225 above 3100. So velocity vs weight, vs powder…. Or if you want to split the difference get a Lapua. All are amazing cartridges in their own right, but it depends on how you want to run the race.