Thread: Rifle canted, scope level

I'm not sure if this guy is wrong, or I just missed the point he's making.
If the scope isn't centered horizontally above the bore, when the bullet is fired it will have to travel horizontally in order to hit whatever the zero point is, and beyond the zero point will continue to travel horizontally away from the line of aim.
An analogy is 2 lazer beams, one fixed and one tiltable, acting as our bore and scope. If there is a distance beween each lazer (same scenario as distance between scope and bore) one of the beams will have to be tilted so that the beams cross at a point, say 100m, and this is our point of aim. Beyond the 100m, the beam that is tilted carries on it's tilted path away from the fixed beam. If the lazers are in line horizontally (i.e directly one above the other), we only have vertical deviation to worry about downrange, and this is what the sight height in our calculations (ballistic apps etc) accounts for. However if the lazers aren't horizontally alligned (i.e they're sort of beside each other rather than directly on top, we would need to take that in to consideration with our calculations too as a sight-off-to-the-left-or-right measurement.
Maybe he did say something about correcting for the horizontal difference between bore and scope and I just missed it?

Im the same as Muzza. Both prone and standing i have the rifle slightly titled to the left, it fits better in my shoulder. So i align the scope to how its shouldered. As long as i hold the scope near to level for most shooting and level for longer range its fine.

Its only an issue if you set it up straight then cant the rifle over and shoot. At longer ranges its enough to miss target completely.

Have gazed thru some atrociously set up scopes. Have turned to the owner/owners and asked "is that alright to you?" Mostly the reply is " yeah yeah."

Most Running Target shooters have their rifles set up with a few degrees of cant. This is so you can lift to the shoulder and sight without having to tilt your head to the side. Less body movement required during the lift and less strain on muscles gives a fraction more time to acquire the target and a smoother track. In fast runs, you only have 2.5 seconds to lift, acquire and fire. The distance to target is always the same so once the rifle is zeroed, all good.

I can’t imagine operating with cant and varying distances because your scope adjustments are going to have to be in both axis.

If your scope centre is at a height of 1.75 inchs to centre of yr barrel bore.And yr scope vertical line is 8 degrees off plumb which is really easy to see.The length of the circumference line on a circle of a radius of 1.75inchs between plumb and yr 8 degrees is only about 1/4 of a inch.
So if you zeroed at a 100yds,your bullet at 200yds will only be a 1/4 of a inch to left or right.So scopes that are 1 or 2 degrees off plumb to bore you never notice out to 500yds.

It's piss to do a quick alignment. Get an A4 piece of paper and a ruler, draw a thick line down the middle with a marker pen (top to bottom of paper). Place the paper on the ground, loosen scope so you can adjust it, stand your rifle on it (rifle butt on the paper). Try and align the rifle butt center with the line. Look through the top of the scope and align crosshairs with the line on the paper.