On the bench or ground in the prone position I rest the palm of my left hand on the scope and "catch" the case as it comes out of the ejection port with my left hand fingers. Exchange spent with loded case with the right hand and close the bolt. The left hand on the scope keeps the gun stable in the bags.

Standing in the field I tip the gun on it's right side and cradle it with my left hand, thunb under the stock and fingers over the ejection port and scope. Work the bolt with the right, catch the case in my left hand, exchange the spent case with new one in right pocket with right hand. Rotate the gun in an upright position and close the bolt with the right hand on the new round.