The 460 S&W is pretty hard on scopes. Between my 460 S&W & 500 S&W, I broke one Bushnell Trophy handgun scope. Bushnell wouldn't honor their warranty saying the scope had been "abused."
I also broke 2 T/C "Recoil Proof" scopes but T/C replaced them both with new scopes. In addition, at least 2 Leupold 2.5-8X scopes have malfunctioned while on my 460 S&W but Leupold fixed them both at no charge.
The conclusion; put a good scope on the barrel from a manufacturer who will honor their warranty.