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Denis, Leupold states these Fit - Weatherby Mark V (Long Action, Magnum: .378 & .460 W.M.) and Mark V Ultra Lightweight Magnum (for use with serial numbers beginning with SB or SS). Leupold Customer Service may be able to provide a definitive answer at 1-800-LEUPOLD or by online inquiry here : https://www.leupold.com/service-support/contact-us

I would just contact them for better info