RE: Would it be a sin...
You could probably get away with that if you are hunting in flatlands with little chance of hurting the scope and a mild kicking caliber. But if you are shooting a harder kicking caliber (30-06 or stouter), and hunting in rugged terrain, I would spend a little more on optics. My Sako has an old 4.5-14X Leupold Vari X III and it has taken a beating over the last ten years without ever losing it's zero.