The problem with enlarging bitmap images is you lose a lot of the crisp lines. The labels that I replicate are all vector images (i.e. they can be scaled to any size and retain crisp, sharp lines).
Here's a visual example. I took the GF-777 labels from the above images, resized it, and cropped it for the example. I left the resolution at 72dpi. In the picture below, the resize is on top and the vector image (at 72dpi) is on the bottom.
