When printing mailing labels from the system, you will need Avery 5160 labels.
A common issue with printing from the system is that the labels do not line up correctly. Here is a tip!
When printing from Adobe Reader, make sure that the 'Auto-Rotate and Center' box is unchecked. Also, make sure that the Page Scaling drop-down is set to 'None'. If your version of Adobe is not displaying those options, there may be one called Page Sizing & Handling. That should be set to Actual Size.