Red River's 8.5x11 scored card stock is your best bet for custom note card printing. The finished card will fold to 5.5" x 8.5".
Why this size? The smallest sheet your printer can use is 8x10. Our line of smaller scored cards will not feed or print properly in a 4000 or 4800.
Creative Option - Another option is to print two cards on one 8.5x11 scored sheet and cut it in half. Your resulting card when cut and folded will be 4.25" x 5.5" in landscape format (see below) A basic Photoshop template for this layout is available on our website.