Well, I understand what you're trying to do....but it still strikes me as less satisfactory than running hot in the final moments, and using the safety,which is a three position safety, and disengages the sear when in the full
"safe" position...there is no intentional "intermediate" position to the M70 cocking function.If you wind up with the bolt handle fully up,you are uncocked, and if fully down, you are in "fire" mode.....anything between is not part of the the way the rifle is designed,and you are slight downward movement of the bolt handle away from full fire mode,the force of the firing pin spring being the only thing seperating you from disaster.
The same forces which could move a safety off could also cause that bolt handle to move down far enough that you move to "full cock",and there is now sufficient force imparted by the firing pin spring to cause a discharge....the reason your Sako did not fire when you tried it.
This reminds me of a friend who, when I first hunted with him,noticed that he would chamber a round with his Rem 700,and then
slowly lowered the bolt handle while holding the trigger back so that the firing pin was resting against a live round. His logic was that with a swift up/down movement of the bolt handle, the rifle was cocked and ready to fire....I asked him what happens if he drops or jars the rifle with the firing pin in that position...?
Slung is a no brainer and I can see simply closing the bolt over a full magazine,but empty chamber.
I certainly would not trust the tactic with a Sako, either....notwithstanding your "tests".
I hear these peculiar fears mentioned now and then about safeties being mysteriously moved off;generally it demonstrates that the user is not fully aware of the rifles status at all times,slung, hand held or whatever.These things should be automatically monitored.
I also hear about noisy rifle mechanisms scaring game, and we have round robbined about the issue here. I have no doubt it happens now and then,but I am not going to modify my use of the safety to accomodate the concern; if you are practiced enough, moving a M70 safety from fully engaged to fire mode is simple and so fast I don't give the matter a second thought even under the most extreme circumstances.
My last elk was approached from a distance, the rifle slung,empty.I chambered a round after dropping into a sit,engaged the safety immediately,with the herd moving up through a draw at 175 yards.Only when the targeted bull came into view did I disengage the safety and he was dead at the shot seconds later....nothing spooked......
In sharp contrast,last years mule deer buck required a long stalk thorugh broken country...as we approached where he'd been last seen,I stopped ,chambered up,fully engaged the safety and as we moved in slowly, he appeared at about 70 yards runnning in front of me; I had about 3-4 seconds to mount,aim and fire, as he ran past...I killed him first shot, the safety coming off as the rifle was mounted.
So you'll have to forgive me if I seem a bit incredulous at the question and the tecnique as I find it particularly unsound, and unsatisfactory. My suggestion is that a guy should practice with his rifle until he can manipulate the action and safety without giving the matter a second thought;this stuff should be so automatic in the presence of game, that you have no conscious memeory of having done it...it just "happens" through muscle memory resulting from repeated practice.
You can likely tell I don't like your idea,for which I apologize.
But I really think it ain't so hot....