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Old June 7, 2011, 01:00 PM   #24
Dave Anderson
Senior Member
 
Join Date: March 4, 2011
Posts: 295
Quote:
You're right,that should have been "30 MOA".
I was sure it was a typo or "slip of the lip" as Jim Watson put it. It is evident from reading the entire post that kraigwy knows what he is talking about.

Quote:
And even with no wind, I have to go an extra 2.5 minutes left on the scope windage.
Spin drift from a right-hand twist barrel, no doubt. With an accurate rifle the effect of spin drift can be seen even at 300 yards, once you get out to 500 yards and further it becomes obvious.

David Tubb designed a scope reticle in which the bottom half of the vertical crosshair was curved, to allow for spin drift at various ranges.
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