I have an IOR M2... a VERY nice scope. I highly recommend it. If yours does not come with the IOR rings and base, let me suggest the Armalite 30 mm base. The M2 is a 30 mm scope, not 1".
The IOR is more of a battle rifle scope than a varmint scope, but if the 4x satisfies you, I see nothing wrong with it. It has a nice little rangefinding scale, and bullet drop compensation for the M855 62 grain pill. That should work pretty well for 55 and 69, too. Since what you want is military glass, you will like the M2.
And the reticle lights up, too.
You will like this scope!
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Edited to ad, I was not that impressed just looking at it in catalogs. I read the blurb, and passed it up. It was not until I had a chance to actually see and handle one on my older son's carbine, that I really became enthused about the M2 and ordered one for myself. He did not say anything about the scope, I asked to look at it. Immediately knew (like the movie Independence Day), "Wow, I gotta get me one of these!"