The trick is not closing the eye behind the scope sometime during the trigger squeeze.
If the rifle/scope combination is set up to fit the shooter,the shooter sees the target with both eyes open,and just shoulders the rifle.The scope is brought to the eye.
If a 56 mm scope bell requires high rings and the comb must be low enough to clear an open bolt,then the shooter goes searching for the hole through the scope with his scope eye,and the other may be closed.
There is good reason why the low mount fixed 4 x scope was the standard for decades.
The point was hitting heart/lung shots and not bench rest groups.
I find I can look through a scope longer without my eyes going wobbly with both open.