Bart,
Sounds like you are in the market for something a little different and not standard, and this may have no bearing on the subject whatsoever, but...
Sounds like you want a hot 270 in a Ruger No.1 B. Ruger chambers the No. 1 B in 270 Weatherby Magnum. Ballistics should be every bit as good if not better than the AI. I had one of these rifles years ago. It was a shooter. I used 140gr bullets and it was a very destructive combo for deer, coyotes and wolves. I'm not sure about the expense of the conversion to AI, but if you go with the Wby Mag, you get for the price of the No. 1B, no conversion necessary.
While at a purely practical standpoint, these improved cartridges probably don't offer alot more performance over their standard cousins, given the small caliber size, dead is dead right? What I noticed with the Wby was a lot more bloodshot meat (guess I should've used 150's) and huge holes in animals compared to the Winchester flavor. The problem with suping up something in a sub 30 caliber for big game hunting is that you are still limited to what you want to hunt with one. I'm sure the 270 Wby will take Elk and Moose as will the 270 Winchester, however, I'd feel much better using a 30 caliber or better. So will the 270 Wby take a whitetail deer better than a 270 Win? I guess it depends on your definition of better, but I don't think the deer will know the difference. That much extra velocity equals more hydrostatic shock and more bloodshot meat. 270 Win has a trajectory that is flat enough and will take deer as far as practicable, so I don't really think there is really an advantage. However, if you look at the reason you use a 270 Win, its because you want a flat trajectory and warranted killing power for the animals hunted at long range right? If that is the case, then faster should be better. If 3000 fps is good, shouldn't 3300 fps be better? I don't know. I do know that I now hunt with a 7x57 Mauser, instead of a 7mm Magnum for up to Caribou sized game and prefer to get within sane shooting distance and make hunting skills a large part of hunting and not rely on just shooting skills.