Does anyone know of a reduced 500 NE load that would still be capable of taking a Buffalo? I am looking for something with less recoil still capable of using on Buff without having to re regulate the rifle.

The reason I ask is that I am having a 500 NE built. I want my father to be able to shoot it if he wants to on our upcoming TZ hunt. He doesn't shoot much but can fire a 375 H&H of the bench without problems.

Is this a possibiltiy?