I’ve seen quite a few lightweight 458WM rifles in the 7.5-8.5lb range, that’s just too light. I imagine it’s due to the popularity of the cartridge and being able to be chambered in standard long action rifles. The Ruger No.1 is a good example.
I find my new Model 70 at 9.0lbs to be too light for full power 500gr 458 WM loads.
I believe 10.0-10.5lb would be an appropriate range for that cartridge. That brings the recoil numbers down to around ~65 ft-lbs.
Rifle Fit, Powder Charge, and Recoil Velocity matters. Personally, there is a factor of recoil Momentum, recoil Velocity, and recoil foot pounds that is not always captured by formulas. I respect the formulas as attempting to enumerate all this mathematically. Like foot-pounds of Muzzle Energy, this is not always relative to our human response to dynamic recoil.
. Weight of rifle and powder charge is factor is a function of the specifics of the rifle.:
THREE Examples:
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Whitworth, 458 WM weighs 8.6 pounds bare, 9.25 pounds with a Leupold 1-4x in Talley mounts. The stock profile fits me perfectly, (and I have two more Whitworth stocked rifles) and I shoot 500 grain 2150fps loads (74 Varget) accurately.
Definition of accuracy is 10 shot string, in 3 groups, with proper accuracy. We can debate accuracy on another thread, but hitting an 8" pie plate at 60 yards, every single shot is the standard.
400 grain Woodleigh SP at 2200 no problem.
350 grain Hornady SP at 2500 fps just slap me (70 gr. H4198)
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Ruger#1 450/400 Nitro, 400 grains at 2100fps. I hated to sell it, but I knew I couldn't shoot it accurately. It just knocked the piss out of me, worse than my CZ550 .500 Jeffery. I loved the excellent wood, bluing, balance of that Ruger, tried many different powders and loads. Okay with 300 grain bullets at 2400 fps, 400 grain at 2150 fps beyond my capability.
Ruger .416 Rigby Safari Magnum vs CZ500 .416 Rigby American Safari:
A big difference in shooting each.
First owned a CZ 550 Rigby American first year production..
Reloaded up and down to potential with several powders. Basically 25-30 grains more powder from my .416 Taylor or even .458 Win Mag.
The Ruger RSM did not fit worth a damn. The Ruger rifle was the forlorn beautiful brunette of our youth. Proper action, beautiful stocked, nice metal.
The Ruger RSM kicked way more than the CZ 550.
The recoil velocity from 17fps and above is significant.
By the mathematical charts, 70 ft.lbs. recoil energy is my limit.