Thread: Scope setup help please

Scope only has 42MOA of adjustment.
In a perfect world it could only just be zeroed at 100 with a 20moa rail, if everything lined up perfectly, with a whole 2moa to spare - but that is rarely the case.

Bore would need to be perfectly concentric with everything else in order to zero it at 100 and have the theoretical 22 moa remaining elevation usable. It rarely ever works out perfectly, it can go either way (more or less remaining) depending on how the particular firearm is put together.

In order not to run into any surprises, and zero a scope at 100 with a 20MOA rail - a scope should really have 50+ moa of elevation (preferably more) to ensure it can actually be zeored once manufacturing tolerances (in the rifle) are factored in.
Would suggest either a 0, or 10MOA base.