Please help!

The problem either the mount point on the receiver, the rings, or the scope

The OP has already changed the rings out (and I assume carefully/loosely allowed both them & the
scope to settle into clean alignment before tightening everything up).

I hate to say it, but change the scope out to ANY other (even cheap) scope and see if the problem
persists. If it does, then it's the physical attachment point on the receiver.
 
I know nothing about the internal optics of a rifle scope but I still say it couldn't be physically out of line.
The scope would have to be physically off the barrel farther than its shooting right at 100.
Maybe, somehow the optics could cause it but I can't see how it could possibly be a mounting issue.
If its 1/2" right at 100 and dead on at 200, the scope would have to be a full inch off the bore.
You could be 1/16" off and be zero at 25 which would make you 1/4" off at 100.
100 and 300 is completely different.
Unless the OP is talking like 1/16" right at 100 and 1/16" left at 300, I say it ain't possible. Even then, it'd have to be an 1/8" off axis.
 
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Gentlemen, the scope and the bore are out of alignment.

That said, are the barrel and the receiver in alignment?
Is the barrel itself straight?
 
Bah!
The OS descriptions are confusing. I can't keep it straight.

The more I look at it the more it sounds completely normal.

If you're 2" left at 200 you SHOULD be 3" left (minimum) at 300. Most people and most guns will be worse than the math minimums.
 
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But he's on at 100
If it's just zeroing error, then he would off to the same side by the same MOA (i.e., ½" left at 50,
1" left at 100, 2" left at 200, 3" left at 300. etc, etc) regardless of range.

Perhaps you have a better idea?
 
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I do.

The 100 yard zero, isn't.

The OPs stated number in post 11 make a physical misalignment of the scope and bore impossible, IMO.

Zero at 100 and 2" left at 200 would indicate the scope is 2" off axis.

He could be 1" left at 100, 2" at 200 and 3" at 300. That would be perfectly normal.

I think the groups are too small to be statistically valid, are aberrations and further shooting would prove much more normal groups.
 
Then "zero" at 300 and bring it back to 100 to check.
By his accounts it would then be right-of-center at the shorter range.
If not, his original zero was off and the problem never existed.

But the OP did say he has wrung this situation out multiple times at multiple ranges and with equipment changeout to no effect.
 
Just for fun, I would zero on an actual zero target at 200 or 300 and then come back to 100 and see what happens.

And concerning the scope/bases not being in perfect alignment with the bore, is it expected that a factory rifle would be perfectly aligned?

edit...looks like you beat me to it!
 
Just for grins,...

I suggest the OP get a metal yardstick/straightedge and lay one end alongside the receiver on each side to see if the distance between the straightedge and the end of the barrel are the same left vs right.
 
I have to agree with meheavy. Sounds like the receiver was not drilled perfectly straight or the barrel is out of alighnment with the receiver. And no it doesn't have to be off by 2". Think about the angles involved. A long range scope base is elevated at one end to allow sighting a rifle in for 1000+ yard shooting. Is that offset measured in inches? No, it is measured in millimeters or thousandths of an inch, normally in minutes of angle. 2 minutes of angle across a 6" long receiver is not much. If the holes that the scope bases are mounted to are off by 20 thousandths, then what would the offset be at 200 yards? Combine that with a change in bullet and possibly velocity, a slight cant of the scope, and maybe a slightly inferior scope and you could have your answer. I would look very closely at how well the scope base mounts align with the barrel.
 
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