baldhunter,
I wondered where you came up with some of your notions. Unfortunately, while ballisticstudies.com is interesting, it's not the entire body of knowledge on ballistics--especially his notion that it's impossible to get any more velocity from 7mm bullets than can be produced with the 7mm STW. That sort of idea is simply not true, especially since more progressive-burning powders keep appearing.
You might want to check out recent data, such as the latest Hornady and Speer manuals, both published in the past couple of years. Both list the 7mm STW and 7mm RUM, and both happen to use the same barrel lengths for both rounds, 26" in the Hornady and 24" in the Speer. With 160-grain bullets (traditionally considered the best all-around weight for 7mm magnums) the RUM beats the STW by 150-200 fps. Which it should since it has more powder room.
