I bought one of the first Remingtons available in 300 RUM and I'm happy with it, but if I had to go buy another rifle chambered in 300 RUM, I'd get the Savage 116BSS. I'm thinking about buying one of the Savages in 300 RUM anyway, they just weren't available until long after I had bought my Remington. If the 300 RUM is like my experiences with other calibers, the Savage should be a bit more accurate than the Remington. By handloading though, I have gotten my Remington groups down to 1.25" for 3 shots at 100yds, but I was hoping to do a bit better. Anyway, if I were you, I would get the Savage in whatever model you like best. If you are recoil sensitive, you might want to consider one with a muzzle break or getting an aftermarket break installed. The recoil isn't very bad in my opinion, but I'm not too sensitive to recoil. If you can handle 12ga 3.5" loads in a pump shotgun, then you will have no problem at all with the 300 RUM.
As for optics, get a good scope such as Leupold or Burris. Even their cheaper models stand up to recoil better than most companies' top of the line scopes. I tried two cheap scopes on mine while breaking in the barrel and starting load development and both were trashed in no time. A Simmons Pro-Hunter 4-12x40mm AO lasted 2 shots before it blew a seal and lost all nitrogen. A Tasco Mag IV in 4-16x40mm AO lasted about 40 shots until the elevation adjuster went crazy and it would back out a few clicks (or what were clicks, now non-existent) every shot. I have used scopes like these with success on rifles in the 30-06 range, but the 300 RUM is just too much for them.
For loading the 300 RUM, you will need powders that are very slow burning such as H1000, R25, and AA 8700. I currently use H1000, you can check out
Hodgdon Powder for loading recommendations. For bullets that will be used on game larger than whitetail, you will need something tough, such as Nosler Partitions or Swift A-Frames. For whitetail, I have had good luck with Sierra 180gr GameKing BTSP's and Nosler Partitions, although the Partitions are a bit overkill and aren't really necesssary. You will definitely want to use a magnum primer with this cartridge. My die setup consists of a standard full-length RCBS die set used in my RCBS Rock Chucker press. As another note, as with any of the big magnum cartridges, keep an eye on case length and case life.
As for advantages of the 300 Weatherby over the 300 RUM, the only ones that I can think of is that there are more brands of brass are available, easier to find load data, and rifles chambered for it are easier to find. If I'm picking, I'll take the 300 RUM every time. Hope this helps.
