I came within a gnathair of doing the same with my 7WSM, except in 9.3.
Then I saw the add for CDNN's Ruger Alaskan in .375 Ruger, lefthand, stainless. In a rare brush with common sense, I said "What the hell am I doing here?".
Then I kept shooting .5 inch groups with a factory rifle pushing the 180g VLD at and above 3000 fps.
I'm glad I held back. However, I offer no advice to do same.