What is the math on calculating max scope rail moa for a .338 lm and still get 100yrd zero. I been surfing, found lots of mil, moa conversion etc. Say your german scope has 100cm/100m as an example. Can you use a 45moa base and still get 100yrd zero? Thanks guys.
Rifle Scopes Max scope base MOA, with 100yd zero
- Thread starter johnl
- Start date
Re: Max scope base MOA, with 100yd zero
John,
In the example you gave, No.
100cm @ 100m is the same as 10 MILS @ 100 YDS. A 45 MOA base is around 12.5 MILS. Since your bases slope is greater, @ 12.5 MILS than your scopes max available up travel @ 10 MILS a 100 yd zero is not mechanically possible.
Bob
John,
In the example you gave, No.
100cm @ 100m is the same as 10 MILS @ 100 YDS. A 45 MOA base is around 12.5 MILS. Since your bases slope is greater, @ 12.5 MILS than your scopes max available up travel @ 10 MILS a 100 yd zero is not mechanically possible.
Bob
Re: Max scope base MOA, with 100yd zero
You confusing 100cm with 100 MOA? If you named the scope it would be easier to help you out. A scope with 100 MOA of elevation, like the S&B 5-25x56, would theoretically work fine with a 45 MOA base. That said if you needed to use windage to zero that would cut down on your elevation so it would make it more unlikely to get a 100 yard zero.
A 30 MOA base would be a better option if looking to get a 100 yard zero and it would still give you alot of elevation.
You confusing 100cm with 100 MOA? If you named the scope it would be easier to help you out. A scope with 100 MOA of elevation, like the S&B 5-25x56, would theoretically work fine with a 45 MOA base. That said if you needed to use windage to zero that would cut down on your elevation so it would make it more unlikely to get a 100 yard zero.
A 30 MOA base would be a better option if looking to get a 100 yard zero and it would still give you alot of elevation.
Re: Max scope base MOA, with 100yd zero
For people's reference who might like to calculate for themselves, consider this:
There are two angular components to a short-range - say, 100 yard - zero.
One is compensation for the height of the scope over the bore. That angle may be computed as:
angle = arctan (height above bore / distance to target)
In the case of my AI, for example, with a height above bore of 1.75 inches, at 100 yards (3600 inches) it's:
angle = arctan(1.75 / 3600) = .03 degrees or 1.67 MOA
The other component is the drop from the muzzle to the zero range. With my load at 100 yards, that's about 2.7 inches, or, using the same formula above, about 2.58 MOA.
Add those two up, and it's about 4.25 MOA or about 1.25 mil.
Which is probably more than anyone really wanted to know. But that's the amount of elevation which is consumed by a short range zero, which the interested readers, if there are still any, can compute for their own setup.
For people's reference who might like to calculate for themselves, consider this:
There are two angular components to a short-range - say, 100 yard - zero.
One is compensation for the height of the scope over the bore. That angle may be computed as:
angle = arctan (height above bore / distance to target)
In the case of my AI, for example, with a height above bore of 1.75 inches, at 100 yards (3600 inches) it's:
angle = arctan(1.75 / 3600) = .03 degrees or 1.67 MOA
The other component is the drop from the muzzle to the zero range. With my load at 100 yards, that's about 2.7 inches, or, using the same formula above, about 2.58 MOA.
Add those two up, and it's about 4.25 MOA or about 1.25 mil.
Which is probably more than anyone really wanted to know. But that's the amount of elevation which is consumed by a short range zero, which the interested readers, if there are still any, can compute for their own setup.
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