I want a spotting scope to make things easier when sighting in my rifles at the 50-100 yard mark. I'm assuming something like 50x magnification should easily let me see a 7.62 hole at those distances. If this is so, is there anything wrong with getting a cheaper (ie 50$ range) product? I'm not taking this into the field. It needs only to withstand the rigors of the passenger seat and the table top from which I will be firing. Can I afford to cheap out on this?