I plan to do the same for my M70 Super Grade .458 WM, and stick it into a Bell & Carlson Medalist stock to save the wood from scratches. No hurries, no worries, that +3.4" box will handle ammo loaded to 3.4" COL and that is plenty good with most 400-grainers. And, as you say, single-loading works fine for now, my rifle ejects a 3.54" COL if chambered and not fired.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
