any SFP can be used this way. say the variable range is 3x15 which means that the scope mags goes over a range of 12 and divided by 2 or 6. So the MOA/Mil subtension will 2x that at 9x so the holdovers will be 2x the amount of their markings. Thus the 2 Moa/mil will be 4 etc.
Wouldn't the values double at 7.5x?
If the subtensions are accurate at 15x, then yes.
If the mag zoom range was 0x15 then 7.5 would be double.
The relationship between reticle subtension and magnification doesn’t depend on the range of magnification settings built into the scope. It could be a 1-15x SFP scope or 5-15x, the subtension values at 7.5x are double the values at 15x.
