Muley Hunter.....I loooovvveee mine and have had it for 6+ years. It's a 300 WSM (I wanted the short action) in a titanium Remington action and carbon fiber stock, so I believe I ordered the "custom". It is 6.5 pounds scoped and it easy on the shoulder with its titanium muzzle break. The only neg I have is it is loud, but that is the sacrifice for reduced recoil. It is consistently reliable and sighted in when I go to the bench to shoot, in fact I don't know that I have ever had to adjust the scope, except when I changed loads. I like it so much I have sold off other guns and it really is the only rifle I hunt big game with now. I personally like hunting with one rifle that I am very familiar with. My wife even likes hunting with it. I told her we'd get her her own rifle, but she just wants to shoot mine.
You mentioned a half inch group being not that big of a deal to you, and neither was it to me. I used to always say I just needed a rifle that shot "minute of deer" and almost all of my hunting shots were inside 250 yards. But now that I have a rifle that shoots 1/2 inch groups consistently, and with the confidence this gun is always on, I now sight my bullet drop reticle at 400 yards and verify the primary reticle at 100 yards. I am very comfortable to consistently make 400 yard shots in the right hunting situations. I would think shooting the 300 RUM you will want great accuracy to take advantage of that caliber and its longer range potential. Simply put a 1" grouping rifle will group at 5" at 500 yards and that is 1/2 the diameter of a typical kill zone just in the accuracy of the rifle itself. A 0.5" in grouping rifle will group at 2.5" at 500 yards allowing more for other variables.
