With a new barrel blank, any rifle can be chambered in just about any chambering that uses that rifles' bolt face. If it's a magnum caliber rifle to begin with you can put a new barrel on it, and make it whatever magnum caliber you want it to be
There are many good 7mm cartridges that are factory loaded and will do everything you want/need.
that have the magnum bolt face.
The 7mm RUM is still king of the factory 7s but the STW is not far behind. the venerable 7 rem mag is still a great cartridge that will satisfy most needs.
There are some great wildcats also but with wildcats comes with there own unique conditions.
J E CUSTOM
Could a Howa 1500 or Weatherby Vanguard be chambered in the Gunwerks 7mm Long Range Magnum ?
Isn't the 7mm LRM basically a 375 Ruger necked down to 7mm?