Consider where and what you'll be hunting. Given it's velocity, a .30-30 is generally sighted in at 150 yards. The advantage of the scope is not its magnification, but the fact that the aiming point and the target are on the same focal plane so are in simultaneous focus. The advantage of magnification is that it allows us to see the target and see details of the target. The greater the magnification, the smaller the field of view, to the extent that when hunting with excessive power, you might see a patch of hair, but not be able to identify the part of the animal you are aiming at. Conversely, with a low power scope, used on a bright sunny day, an animal standing in the shadow of a tree or a bolder might not be visible when looking at it through the sight.
For a 150-200 yard rifle, I would choose a 1.5-5X or a fixed low power scope of 4X or less. One problem you might encounter with a low cost variable is that they sometimes shoot to different points of impact when adjusting between low and high power. Fixed power scopes are usually less expensive, but good glass, fixed or variable is expensive, but given the unlimited lifetime warranty of Leupold scopes, new or used, sometimes you'll find a used one that is attractively priced. Send it to Korth Agencies before you mount it to ensure its good to go, or they will fix or replace it. You'll get your scope back in a short period of time, with an explanation of the work they did, and your cost is only shipping .