I use a bushnell holosight II. However, I can not say that it is ideal for changing from super sonic to sub sonics. Check Horus vision. Horus uses a grid system, and give computer software with their scopes that tell you what grid to use, at what distance. My friend has one he uses for his long range rifle, and can compensate from 100 to 500 yards without changing his settings.
They may have something that would work for you.
Joel
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