Bill Love of "Love and Lee" BC Guides was given a pre-64 Model 70 .375H&H magnum by Fred Bear. The finalie of the hunt had an arrowed grizzly charge Bill Love and Fred Bear. Bill shot the Bear several times, finally anchoring it just feet in front of him. Bill used a Model 70 in .30/06 in those days as his bach-up rifle & likely loaded with 220gr. RN bullets, factory ammo.
Fred presented Bill with the rifle before leaving camp for Smithers to fly home. Fred said the reason was: "I want you to still be alive to guide me on my next hunt."
This was related to me by one of Bill's assistant guides at the time. I'm going to say it was late fall, 1978.