MY, best take on it is, the STW is SHOOTABLE. I have been shooting this caliber since about 1997 or so. About two years ago, I bought a 7 RUM, brand new, just to see what all the hoopla was about. I found it to be finicky, never mind the muzzle blast. By the time I finally found a load that it would shoot consistently, I was less then 80 fps faster then the STW, and a lot more powder burnt to boot!
My bottom line all boils down to the fact that you CAN have TOO much of a good thing. I feel that the STW is about as much overbore as a 284 diameter can be, and still remain SHOOTABLE. Any more is just more fuss, WAY less barrel life, and muzzle blast .
Everyone has their thoughts, those are mine, but I have lots of company. And, I haven't seen any websites, dedicated to it either! Imagine that!