A pet peeve of mine is the flashy silver-colored scope.
Krylon spray paint fixes that easily.
A suggestion for the Roundtop Ruger M77 action is to use the Leupold Mark 4 cross-slot bases and 8x40 screws with J-B Weld.
Same bases as fit the Remington Model 700, cut off any overhang or don't.
Ring options for the standard Ruger integral bases are shown in post above .
Either way is good for a .458 Winchester Magnum.
I used a Shilen Contour #5.5 on a Ruger M77 Mark II for 25" barrel length, muzzle diameter = 0.760"
Same rifle, different stock and scope:
Happy with that, could have used a #5.
Shilen refused to make a stainless #4 in .458 cal. when I asked,
but they did make a #5 which I used on a CZ 550 Magnum, muzzle diameter = 0.710" at 25" length.
A Winchester M70 Super Grade .458 WinMag made in 2011 has muzzle diameter of 0.730" at 24" length.
McGowen made a stainless #4 that I had cut to 23" and it was 0.670" diameter at the muzzle,
on a Winchester M70 ".458 WM+" shown here:
Shorter barrel would give greater wall thickness at the muzzle, of course.
Shortened to 20" it would be about 0.700" diameter at the muzzle,
handy but obnoxious to shoot.