Well, actually having built (chambered with custom recievers) and shot the STW, RUM, and Mag. I feel I have some working knowledge, the STW and RUM are barrel burners for sure, especially when ran at high pressures, you can get a little more velocity but for what price, not sure its worth it. (Imho) That being said they are classic cartridges and like any cartridge has its pluses and minuses. I love the 7mm Rem Mag, it is the best all around cartridge out there, I know there are plenty of people that will most certainly disagree, dont beat me up over it. All 3 are great performers, just find what you like and.... what you can get components for. If you would like specifics about any certain cartridge, please feel free to PM me.