Add to this list:

You have a general hunting rifle or one you rarely shoot that just won't shoot well (accuracy is not THAT important), so you do one of the following:

Option 1: Trade it in for a new (or another) rifle. Net cost - about $500.

Option 2: Keep buying and trying new alterations (new stock, fiberglass bedding, new scope, new trigger, new barrel, etc.) until you realize that you've spent $1,000+ and it may or may not be a tack-driver. Even if it is, you still only shoot it occasionally.