I am guessing that you are using a "traditional" rifle and not one with a target stock. If so, you are kinda stuck, As Tim stated, it depends on your front sight and the type of target. I have an adjustable iris and "tune" it in according to conditions. I don't even look at the settings. I shorten stock to accommodate fit and sight radius. Possibly you could find a longer aperture setup like a merit disk or use two adapters, the first being 7/32x40 to 9.5mm-1mm and the second being 9.5mm-1mm back to 7/32x40.
There are different sight bases as well that could extend the rear towards your eye. But would need to know the firearm model. I have taken a base and cut it in two and rewelded the pieces to accommodate the length which might be the option I would use.
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