Remington' s quality control for yhe past several years has been in the toilet! As a gunsmith I have to dear with this often. I played with the 7 Ultea as soon as the .300 came out. in those days we pulled apart .300 Ultea ammo to get the brass as it was not available for over a year from when the .300 came out. Now to your question. The 7 Ultra will not live up to its potential untill Remington runs a slower twist, you can over stabilise a bullet and accuracy goes to hell. Using 140 grain bullets and a one in nine twist, which is used for the 7 when you go much over 3400 F.P.S. your groups will open up. With a 1 in 11 twist and a GOOD barrel you can get around 3600 F.P.S. and under 1/2" groups. Now, the 1 in nine twist will work well with 175 grain bullets and you can get 3450 with these and good accuracy. Oh yes, the down side to the 7 Ultra. Compaired to the S.T.W. you get substancially more recoil, Poor quality control as far as ammo and rifles are concerned. With factory ammo you will be one or two inches flatter then the S.T.W. at 500 yards but beat to death doing it. Yes you can hand load and with the right barrel, twist, or heavy bullets beat the S.T.W. by a large margin but for what purpose? Few of us want .416 Rigby recoil in a long range rifle and that is about what you get. Even fewer of us, and I am no exception, and I shoot thousands of rounds a year, have the compitance or ability to constantly make killing shots, (a group under 6" ) at over 300 yards. Even fewer of us are good enough,( if our target runs off and does not drop instantly) to be able to find the exact location of our game and pick up a blood trail at these extended ranges.
There is nothing the Ultra can do that should be done that the S.T.W. can not do very nicely. One more point, to get the ultimate from the Ultras, any of them, you need a 29" barrel, where the S.T.W. works very well with a 26" tube.

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Jud