Originally Posted by 2336USMC
Well, there are many ways to skin the cat so to speak.
We are simply saying the same thing viewed from different perspectives.
I am also a lifetime iron sight shooter. As you say, using irons, the rifle must be vertical. And, through practice, you have probably grown accustomed to mounting the rifle in the shoulder pocket vertically.
When I mount a rifle there is an amount of cant. Most shooters have some, it's just the way the buttplate fits into the shoulder. If I'm shooting irons there is no other choice than to adjust to remove the cant, check level, sight, press and fire.
With my adjusted scope I just put the rifle to my shoulder. Cant never enters my mind, it is meaningless, only that the rifle is perfect in my shoulder, comfortable and the reticle is already level. So check level, sight, press and fire. Just as you do.
It is because I don't shoot on the same range with the same bag, the same bench, etc that I do this. In real world shooting the rifle will come to the shoulder in a specific, repeatable orientation. Yours is likely vertical. Mine just happens to have about a 2* cant. So I adjust the scope so it's level with my natural 2* cant. My reticle is not canted, my rifle is. But looking through the scope my sight picture looks exactly like yours. In real world shooting as long as the reticle is level accuracy is not affected.
Some people say tomato, some people say french fries .. or something like that.