Rifle cant

Okay here's my question about rifle canting. If I believe that my rifle is perfectly straight meaning not canted when mounting my scope then why do I feel or why does it feel not level when holding/shouldering it? The way I did mine was since I have a Pro Sport, I put a torpedo level on the cocking lever which is in the open cocking position. And then I use a Plumb line and leveled my scope that way then added a scope level to the scopes tube body. My issue is is that whenever i hold/shoulder the rifle to what "i feel" is level, its totally skewed in the scope and scope bubble level. So i am wondering if i should level the scope to the rifle as if i were holding it to what i feel is level then level the scope or just let it be?
 
IMHO.......level the scope reticle so the poi "up close" and "far away" is in vertical alignment when you're shooting "naturally".



What has worked well for me and my HW95 and R9 break barrel springers is to support the gun on a cardboard box with cut notches, place a "known good torpedo level" on the flat of the barrel pivot block, then rotate the scope till the vertical crosshair lines up with a hanging string..........





This has pretty much solved my "poi left at close & right at far" issues I had when I aligned the reticle by "eyeballing" through the scope.


 
I have the same thing on some of my guns. I think it's to do with how they naturally shoulder. Also I find the things you look at through the scope can give a false impression of cant.

If you've properly leveled everything as you say (only thing I can think of going wrong is if there is a bit of play in the cocking lever allowing it to droop a bit?) then everything should be perfect. Setting it up to 'feel' upright will undoubtedly give you issues as the barrel, action and scope are in fixed relationship, so there is only one 'true' position of alignment.

Try shouldering your gun normally and aim at your vertical plumb line. You'll probably find it all lines up great and suddenly the feeling of cant is less. I suppose if feeling whether the gun is level was easy, we wouldn't have need of bubble levels, electronic levels etc! 😄
 
I had similar concerns. I bought a clamp-on external scope level which clamps to the outside of the scope tube. This way, when out hunting on irregular terrain, I can tell if my airgun is being held level. There is a tendency to "judge" level by your terrain, and when you are on the side of a mountain, level can be difficult to judge. 

1541247723_14887790625bdd92eb778631.40466770_Scope Snail zoom.jpg

 
Some shooters level their rifle scope to a natural shouldering position, in other words they hold the gun shouldered comfortably (canted) bringing the rifle scope to their eye naturally not canting their head to the rifle and leveling the scope in that position. look up David Tubb arguably the best most winning off hand shooter in the world. BTW Chuck from this form has his wildcat set up like that and taught me that trick.
 
https://www.pyramydair.com/blog/2007/08/usft-rifle-part-3/

From the above............

"A natural hold needs a gun built on an angle
The USFT is built in a canted configuration, so the seated shooter doesn’t have to adjust his body. It did make aligning the scope more of a challenge, since I normally align the vertical reticle with the receiver. On this rifle, the receiver is offset to the side until I am seated and holding the gun properly. The scope had to be aligned with me in the seated position. I still don’t have it exactly right; but, once I do, the scope will force me to shoot without a cant. There is no problem in the offhand position, either, because the reticle of the scope aligns you to level. The pistol grip is canted to the right side for a more natural grip angle. Plus, my rifle’s grip has a target palm shelf for stability."
 
Gravity does only pull in one direction, however due to the loopy trajectory and poor BC of those hollow lead badminton birdies called pellets there is more to it than "scope directly over the bore.

When I zero my HW95 at 30 yards the muzzle is actually tilted up so the pellet rises from about 1 5/8" below the line of sight, to the "first zero" at about 17 yards, to about 1/4" above the line of sight at 25 yards, then it falls to the 30 yard zero, then continues falling to about 1 1/2" low at 50 yards. If the gun is canted then the pellet will be "fly to the side" while gravity is pulling straight down...........



Anywhoo.......years ago when living in West Virginia I did a "cant test" at a short 11 yard shooting distance in the basement and proving that my .177 R9 (zero'd at 30 yards) did indeed shift the poi laterally at 11 yards when the gun was deliberately tilted one way and then the other. Never needed to "cant test" at longer distances since the result would only be greater.