What could go wrong?

[Ronin]

Once offset corrections known, it wouldn’t be an issue though as the correction would always be a given (in zero wind conditions) 

[brown dog]

1 minute ago, Ronin said:

Once offset corrections known, it wouldn’t be an issue though as the correction would always be a given (in zero wind conditions) 

Yup, I'd think so. And with a 'collimation' picked at the right distance, depending on what you're doing you could do a sort of  'left and right point blank' range and just ignore it - the values can be tiny 

Thinking on, a 'virtual 1000m collimation' is possible at 100m: Zero 2.7" left

A virtual 500m collimation  at 100m : zero 2.3" left  

(Fagpacketing on 3" offset)

[Popsbengo]

Simple geometry:  If the scope is set up to be parallel and 'zero'ed' with the same offset then that offset is the same at all ranges.  All that's needed then is to add or subtract the offset to whatever the solution is - most Ballistic apps will allow an offset for hight and for offset to the side.

Obviously 2" at 100yds is 2 moa whereas 2" at 1000 is 0.2 moa or not enough to bother with

[brown dog]

4 minutes ago, Popsbengo said:

Simple geometry:  If the scope is set up to be parallel and 'zero'ed' with the same offset then that offset is the same at all ranges.  All that's needed then is to add or subtract the offset to whatever the solution is - most Ballistic apps will allow an offset for hight and for offset to the side.

Obviously 2" at 100yds is 2 moa whereas 2" at 1000 is 0.2 moa or not enough to bother with

Do they allow sight offset (as opposed  to zero offset)?

[brown dog]

4 minutes ago, brown dog said:

Do they allow sight offset (as opposed  to zero offset)?

Thinking on; that only resolves the situation if you always use the app  - the left to right crossover is happening - that's simple geometry - the app being used as you suggest  is allowing a virtual 'infinity' far collimation.

Without it, and just dialling elevation, the crossover will happen in relation to whatever distance the real collimation distance is

[Popsbengo]

5 minutes ago, brown dog said:

Do they allow sight offset (as opposed  to zero offset)?

"Shooter" ballistic App does however I think anyone can simply cope with a 2" adjustment by eye or just dial it on

 

[brown dog]

thinking on again...

Yup, if you treat the 3" offset as parallel and mantronically dial it out as a constant at all ranges:

Taking it as 7.5 cm and 0.1mrad clicks

100 dial 7 right

200 dial 4 right

300  2 or 3 right

400 2 right

750  1 right

Beyond that, ignore

Yup, neater 👍

 

But I suppose that means, you must zero on the parallel line - ie say POI 3" left at 100m, or you'd start chasing your tail

[Popsbengo]

18 minutes ago, brown dog said:

thinking on again...

Yup, if you treat the 3" offset as parallel and mantronically dial it out as a constant at all ranges:

Taking it as 7.5 cm and 0.1mrad clicks

100 dial 7 right

200 dial 4 right

300  2 or 3 right

400 2 right

750  1 right

Beyond that, ignore

Yup, neater 👍

 

But I suppose that means, you must zero on the parallel line - ie say POI 3" left at 100m, or you'd start chasing your tail

Exactly