Maybe take a look at the 7-300win. Its basically 300 win mag brass necked down to 7mm. I think some call it the 7mmPractical. Gives a bit more velocity than the standard 7mm and better barrel life than 7 rum or 28 nosler. Not sure how hard it is to find dies/reamers though. I'm pretty satisfied with my 300 win mag running 210 Bergers (going to experiment more with the higher bc 212 ELD-x, having trouble getting them to group). When my barrel goes south i will look into the 7-300win, 338 edge, or maybe just a 28-30" barreled 300 wm to get just a bit more velocity for my hunting needs. 300 RUM brass doesn't seem to be that readily available which is a factor with the 338edge.