Indeed. You scored on this one. The Pre-'64 M70, which yours is, is among the finest rifles you will ever find. And the .300H&H is still among the most effective of the .300 magnums. If for some reason you want more juice you might consider is rechambering it to .300 Weatherby Magnum. You can still shoot H&H ammo, and to my mind those are the two best .30 caliber magnums available.