RE: 270 WSM
I was not speaking to you about the 300 RUM I was just saying that if bigger is always better then where does that line of thinking end. I have said that I used the 300 Weatherby and 300 Win Mag both for deer. Having done so, I know that they are WAY more gun than I NEED FOR DEER. I have also said that the 300 Win Mag is a good all around rifle if you don't mind the recoil. The 270 WSM falls into a big group of rifles that are very good for deer hunting. If I had a favorite over many years for deer, it would be the 6.5 x55 Mauser.
I also have a 30-06 AI built on a Mauser action and with the right loads, it will equal both of 300 Win Mags that I had. The 30-06 AI will offer a 100-300 fps gain over the standard 30-06. Mine has a 26 inch barrel. I have had several AI versions in other calibers, some had good velocity gains after the conversion and some gained nothing at all. Its a rifle by rifle propisition. Sometimes it works and sometimes it doesn't.