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 07-31-2011, 20:27 #1 TheBelly Senior Member     Join Date: Jan 2004 Posts: 1,211 Blog Entries: 4 POA/POI shift between 100yds and 200yds OK here's the question and it may be a bit long/complicated: All others thing being equal, and using a 0 MOA base for a .308 Win, will the POA/POI shift between 100 and 200 yds be different? if so, which way? Will this difference be magnified using a 20 MOA base? @ 100 yds, the POA and POI are the same, will the POI be higher, lower, or the same at 200 yds? how will the difference be magnified using a 20 MOA base? __________________ Family Values and Traditions So 'true'. Nothing 'false' with a dog. Either they love you, or they can't stand you. RIP Lilly
 08-06-2011, 16:44 #3 TheBelly Senior Member     Join Date: Jan 2004 Posts: 1,211 Blog Entries: 4 If I zero a scope for the 0 MOA base, but then switch to a 20 MOA base, the POI will be a lot higher, is that correct? I didn't think that the .308 started dropping between 100 and 200 yards. Or, more accurately perhaps, I didn't realize that 100 yards was the actual highest point of the path of the bullet. I understand your point about a 20 MOA base giving more 'drop' in elevation to be able to reach out and get the longer distances. I just thought that, given a 20 MOA head start in the upward angle (if the line of sight was parallel to the ground), that the bullet wasn't going to be heading upward still between the 100 and 200 yard marker.... does that make sense? __________________ Family Values and Traditions So 'true'. Nothing 'false' with a dog. Either they love you, or they can't stand you. RIP Lilly
08-07-2011, 11:28   #4
Zak Smith
3Gunner

Join Date: Aug 1999
Location: Fort Collins, CO, USA
Posts: 692
Quote:
 If I zero a scope for the 0 MOA base, but then switch to a 20 MOA base, the POI will be a lot higher, is that correct?
If the mounts were otherwise identical and no other error was introduced-- and you didn't adjust the scope knobs-- yes.
Quote:
 I understand your point about a 20 MOA base giving more 'drop' in elevation to be able to reach out and get the longer distances. I just thought that, given a 20 MOA head start in the upward angle (if the line of sight was parallel to the ground), that the bullet wasn't going to be heading upward still between the 100 and 200 yard marker.... does that make sense?
No. There is no head start. It just changes where the erector assembly is physically in the scope. If you have a 100 yard zero with a 0 moa base and a 100 yard zero with a 20 moa base, you have the same zero and the trajectory is identical.
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