Don't worry about it won't be the first or the last soon to be multi page thread on half-cock. The continued theme to me is it's widely misunderstood and many are using are really unstable position on their rifle.
Try the half cock position on your M70 and give the trigger a good old squeeze. See what happens, I can't tell you as I've owned one M70 and handled several others and some release the sear, some don't. Seems to be solely down to the tolerances in the individual rifle.
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