IMO you are being very optimistic about 250 yard shots with the Hornet. I believe abnout 175 is maximum distance for effective kills, without crawl offs. But that is just my experience with my hornets.

If I were you I would look at a higher quality fixed power scope. 6X is more than enough for a hornet, and you can probably get better glass. If you are shooting varmints only then a straight 10X would not be too much either. Tom.