Re: Whats wrong with the good ole 7mm?
Every cartridge has its pro's and con's. The 7mm RM is a great all around hunting cartridge for big game.
Nonetheless, there are plenty of other 7mm's that offer one or more of the following: more velocity, better brass, non-belted, short action, easier to load, less recoil, sex appeal, etc...
Unfortunately, you can't have it all in any one cartridge. So, we often speak of balance. But, that's entirely subjective.
I love my 7mm RM. But, I've been thinking of building another 7mm. The next one will likely be 284 Win or 284 Shehane as more of a target rifle.
In addition to improved jackets, bullets, and twists, new powders have also opened some doors for experimentation.