Just had it done last summer on a 1" VariXIII 4.5-14 for my Sendero in 300 RUM. It costs about $175. The only downside is there are no marks indicating left, right, up, or down. I used a silver metallic sharpie, but I wish I would have had the custom shop do something. They do engraving, so it shouldn't be a problem. I would go with a III as, from my experience, they have better adjustments. One word of caution, the turrets turn fairly easily so you need to be careful not to spin them during stalks, etc. Check them often. With the magnification range you are looking at and the kind of hunt you are doing, you might look at the Boone and Crocket reticle. I have this on my pack rifle and love it. It works great out to 600 Yards and I am working up charts to dial from there using the 500 yard hash. Best of luck.
Ignorance is bliss...unless you're aware of it.