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Q:What causes scoped guns (rifles, muzzleloaders, etc.) to mysteriously lose their zero over the off-season? Every gun and scope I've owned or handled frequently has been like this - they will be "on" when I put them away for an extended period of time (like over the summer), but then when I get them out and shoot them before hunting, they are almost invariably off, to a varying degree. Case in point: my dad shot his muzzleloader at the end of last deer season, before cleaning it and putting it away for the summer, and it was right on the money at 100 yards. But this morning when he shot it to make sure it was still on, it was hitting 6 inches low and 4 inches to the left at 100 yards. And since I'm the only one to have handled it in the meantime (I cleaned it at the end of last season), I KNOW the scope didn't get bumped. The thing that puzzles me is that this is typical for my guns and scopes too, my muzzleloader (different brand of gun and scope from my dad's) is usually off when I shoot it before the season too, even though it was almost always on when I shot it at the end of the previous season. What could possibly cause a gun/scope to shift its point of impact when it has just been hanging on the rack for the last 10 months?