You are pretty close here but you are missing an enormous step making this whole video useless. Your rifle did NOT stay vertical when you installed it. It absolutely moved when you installed the rings and scope. You level the rifle with the scope installed and then level the reticle. All you did here was level the reticle to gravity NOT the rifle.
The concept as I understand it is... level the reticle to an anti-cant bubble (or other device). Otherwise, leveling anything that excludes the reticle/anti-device combination does not ensure cant has been discounted. If no anti-level device is installed, then there is no way to ensure that cant is not being introduced in the act of aiming. Using a "tall-target" at the range to verify the set-up ensures the anti-cant procedure was successful.
@@BNatoAk Someone on the internet we'll call "Mallninja A" came up with this procedure and it spread like wildfire within the community. Unless you are dealing with a $30 Walmart scope they are CNC manufactured and the elevation turret cap will be perfectly flat and level. You can safely and accurately use that to level off of along with the level on your barrel and or PIc mounted level. Another "flaw" is everyone says to mount the 1913 mount to the forward position of the slot. What happens if you drop your rifle or set it down a little rough or "less than gentle"? That's right it moves to the rear of the slot. When properly torqued it will have more tendency to move from rough handling or a drop than it will under recoil. People don't think these thing through when they jump online and flap their gums about a subject. Worse yet, correct you and tell you that YOU are wrong! I have been doing this in a huge way for 41 years. I don't think I am wrong at all. Even funnier when you point out "this must be the way" mentality is irrelevant because the 1913 Pic rail was only invented in 1992. What did we do prior to that? It makes all your 25 - 30 year old lads claims bogus is what it does! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-srrYlR8n1vI.html Be well!
The only issue with using that method is it’s not 100% accurate. The reticle can be canted inside the scope and leveling off of the flat underneath will straighten only the scope tube. This method provides consistent accuracy because your projecting the reticle on to the wall and using a weighted line. Gravity holds it straight. Hope that helps! Thanks for watching!