Couldn't say how old the STW is but I don't think it's that new.
Certainly there are more and more rifles being chambered for it, not the least of them the Ruger #1.
Funny thing about 7mm is that there are so many well-known cartridges out there for it.
7-30, 7x33 Sako, 7mm-08, 7x57, 7mm STE, 7x64, 7x65R, 280 Rem, 284 Win, 7x61 Sharp & Hart, 7mm SAUM, 7mm WSM, 7mm Rem Mag, 7mm Weatherby, 7mm STW and more recently 7mm Rem Ultra Mag.
There ya go.
The STW certainly is a thumper though.
I don't think the original Rem Mag will disappear anytime soon.
It and the 300 Win are the biggest selling magnums in the world.
Here's an idea for that 7mm crusher you're after. :grin:
Neck down the 50BMG!!!! :eek:
You could call it 7x99 BigBill. :wink:
The ultimate 7mm wildcat. :mrgreen: