RE: Information on the 7mm ultra mag and 300 ultra mag
It depends on what other calibers you're comparing it to. I can't tell the difference in recoil between my 7 RUM and my buddies 7 REM. I believe the RUM uses a slower burning powder which could account for that. After shooting 270 for years at Texas whitetails and some Colorado mulies I moved up the to 7 RUM and haven't been bothered by recoil while shooting 1-1.5" groups with factory ammo.
I love my 7 RUM but if I were buying today I'd go with the 300 RUM due to the wider range of loadings available in factory ammo. The ballistics on the 300 are unbelieveable.
Next year I plan on buying a 300 RUM to add to my collection. I'm a real fan of the RUM family (not the short actions) and plan to add another (375 RUM) for my trip to Africa for plains game.