I'm not sure I understand the problem. But you can get scope bases that are higher in the rear that will give you more vertical adjustment for shooting at extreme long range. You shouldn't need anything special for zeroing at 100-200 yards and shooting out to 500-600.
I am familiar with windage adjustable mounts that will compensate for improperly drilled mounting holes to get the scope aligned with the barrel.
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"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"
Winston Churchill
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