I won't disagree that the 7mm mag offers more than the .270 with the heavier loads but I would be more than comfortable going after larger game with Doubletap's 160gr partitions or 180gr Woodleighs with my .270 and honestly I wouldn't think twice about it.
@JakeH I think you're miscalculating to derive your opinion. Lets take the .270 Win versus 7mm Rem Mag comparison out of the picture.
The .270s (and 6.8s) were designed around a particular chamber and twist rate. Throat length was also standardized a fair amount. So the .277" bullets have a "common weight range" that works well in most guns. The grain weight, volume, and and BCs of the .277" bullets find a sweet spot between 130gr and 140gr with lead bullets whether we are talking about 270 Wby or 270 Win or any of the one-offs.
The 7mm bullet (.284") has inherently better BCs and were built for a different prototype caliber, the 7x57 Mauser aka the .275 Rigby. Because of their military origins the basic bullet was a FMJ of 180gr with an awesome BC. That translated out to the 175gr lead core soft bullet that sort of standardized the loading. The inherent superiority of that bullet versus the bullet of the .270s is significant. Today, we now have copper bullets of the 175gr volume with its great BCs in a weight of 140gr, giving the expansion and wound channel of a 175gr lead core bullet yet with the flat shooting benefits of a 140gr bullet. The throats and twist rates of the 7mm family of guns was designed to facilitate this.
The 7mm bullet size finds itself in a mathematical sweet spot where its natural BCs and Sectional Densities allow it to do things for which smaller bullet sizes like the .277 and larger bullet sizes like the .308 can't achieve quite as easily. This in part explains why people like WDM Bell were able to kill nearly 1000 elephants with a 7mm over 100 years ago...the penetration and precision are native to the bullet for a number of reasons of physics.
I won't dismiss your opinion of the .270 Win being better than the 7mm Rem (I own several of the former) but it is indeed an opinion. I would not be so quick to diminish the 7mm as I believe as a caliber there is no better ever made, regardless if you wish it to be cartridged as a 7x57, 7x64, 7mmSTW, 7S&L, 7mm Rem Mag, 284 win, 275HH, or some other cartridge not listed.