Simple ? for sum

[jo191145]

OK I'm seriously mathamaticly challenged.
Lets see if I can at least ask a math question correctly.

I need to drop my POI 12" at 100yds. Assuming my rings and base are both 6" apart whats the thickness of shim material required?

If you can figure that what would the answer for a 24" drop in POA?

I know this stuff is easy for some of us. I'm not one of them.

 

[BoydAllen]

.020 in front should get you close, if the distance you gave is center to center. Center to center in inches times drop in inches, the answer divided by 3600...To lower POI put shims in front, to raise, in back.

 

[jo191145]

Thank you Boyd for both the answer and the equation.
I'm going to scribe the formula into the wall for future use. So easy a caveman can do it

It might amuse you to know I asked the same question of my friend who's an engineer.,not a train driver)
He had no answer and then wanted to now the trajectory of the bullet. I'm not very smart but smart enough to laugh at that.
Thnx again.

edit Yes my question was rough. Rings are actually 4.210 C to C.
I'll recompute and act accordingly Thnx.

 

[Fred Bohl]

For the seriously mathematically challenged:

Sight Correction Calculator

 

[jo191145]

Thanks for the link Fred. Now perhaps you'd like to explain to the little lady why I had to carve in the wall
Never mind I'll have my engineer friend do the explaining. He must be good at BS to still be in the biz.

Thnx guys