Never owned a 70 but my 700 will release the hammer and not strike the firing pin if the bolt is lifted the slightest amount. At least that is what I believes happens with the bolt lifted slightly as it will sound as if firing on a empty chamber and not strike the bullet.
I discovered this a once shooting at a antelope. Pulled the trigger, gun goes "click" and nothing. Immediately ran the bolt ejecting a bullet onto the ground and then shot the antelope. Only later after examining the bullet, and experimenting a little with the rifle did I discover what had happened.
Perhaps a Winchester 70 is the same idea and the primer was not hit hard enough.
Edit, I did have a 70 (borrowed) not fire a new bullet once shooting at a deer. Lost the deer and to this day I assume it was a bad bullet. It has been to long ago to remember the manufatcures name, but the bullet had been hit hard enough it should have fired.
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