Squatch
Well-Known Member
If I put a 20 or a 30 moa Base on a rifle, do normal ballistic calculators work or do I have to account for the scope no sitting level?
Thanks in advance for the info.
Thanks in advance for the info.
I am putting a 6-24 pst with 65 moa adjustment on a 6.5x284.
Ok, in a perfect world and a good quality rail base, a 20 moa cant would give you 52.5 moa of elevation from a 100 yard zero. A 30 moa base would give you 62.5 moa. I think you would be able to get a 100 yard zero with both, but if the top of the receiver is off any, or the rail is off any, or the scope did not have a full 65 moa the 30 might be pushing it.
52.5 moa will get my 300 win mag to 1700 yards. Just short of a mile for reference.
Jeff
How did you do that math on that? If you don't mind sharing.
In a perfect world with all machining and specs perfect. a zero cant rail would give you give you 1/2 of the 65 moa the scope has up and the other 1/2 down. So 32.5 up or down. Then the 20 moa rail will move 20 moa from the down side to the up side equaling 52.5 moa up that you will now have for dial up. Then I ran the numbers in my Applied Ballistics app for my 300 win to find 52.5 moa was 1700 yards.
Jeff
Great explanation. The only thing I see missing here is the few moa it takes to get zeroed. For a 200 yard zero it takes around 4 moa since your bullet starts out below your line of sight and drops a bit during the 200 yard flight. Of course the machining tolerances will vary, but I've yet to have a 20 moa rail give me more than 20 moa above center after zeroing. I've seen anywhere from 10-20, which makes sense if your tolerance is +/- 5 moa and you use 4 moa to get zeroed.In a perfect world with all machining and specs perfect. a zero cant rail would give you give you 1/2 of the 65 moa the scope has up and the other 1/2 down. So 32.5 up or down. Then the 20 moa rail will move 20 moa from the down side to the up side equaling 52.5 moa up that you will now have for dial up. Then I ran the numbers in my Applied Ballistics app for my 300 win to find 52.5 moa was 1700 yards.
Jeff
Great explanation. The only thing I see missing here is the few moa it takes to get zeroed. For a 200 yard zero it takes around 4 moa since your bullet starts out below your line of sight and drops a bit during the 200 yard flight. .