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If it shoots 'Left' before 100 yards, then shoots 'Right' after 100 yards,
Its for sure the barrel cocked in the reciever.
If it angles, then it might be cant in the optics/rings or barrel cocked, either one.
Everyone seems to be stuck on using a level on the reciever, which is correct,
But they also use a level on a scope cap, which is dead wrong.
That cap/knob/turret isn't required to be square, it only turns a screw internally, so no reason for the factories to make them right angle true to the line of sight.
Without lasers, the ONLY way to ensure your tube lines up with the bore is to bore sight on a verticle string,
And gravity never lies!
The first spirit level on a rifle I ever saw was in the Marine Corps,
It was also the first time I ever saw a rifle shoot 50 yards to 1,000 yards right on the ballistics tables,
Check the ballistics table, dope the scope, point of aim is point of impact.
That's where I learned to true the reciever, check the barrel for true, and true the optics mounts...
Level the reciever, true the optics with a plumb bob line, and off to the races!
Suddenly the ballistics tables I'd been seeing for years made sense!
That was the first rifle I ever shot that would shoot smack on the tables.
If you missed, it was you and not the hardware or tables...
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