So the 460 Weatherby Magnum throat is not an accuracy impediment, just not as handy with .461"-diameter cast bullets as the .458 Winchester Magnum, but there are certainly no flies on it for .458"-diameter monometal copper:
Practical rifle aspects: 30-yard point-blank range advantage of the 460 Weatherby (2900 fps) over the .458 Winchester Magnum Plus (2600 fps): .458 WM+ 40-yard point-blank range advantage of the 460 Weatherby (2900 fps) over the .458 Winchester Magnum (2500 fps): .458 WM SAAMI with 400-gr GSC HV having BC = 0.372. Zero for 2900 fps is 250 yards. Zero for 2600 fps is 225 yards. Zero for 2500 fps is 215 yards. Muzzle-KE/ 300-yard KE: 7469 ft-lbs/ 4274 ft-lbs 6004 ft-lbs/ 3344 ft-lbs 5551 ft-lbs/ 3060 ft-lbs respectively. All are quite adequate for deer to 300 yards.
Less recoil, lighter rifle, greater magazine capacity with .458 Winchester Magnum: Better deer rifle.
But hey ! How about a .458 Winchester Magnum Weatherby Throated (460 Winchester Magnum) as a specialized rifle for monometal copper ?
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.