I ordered a bunch of prints from a shop i've been using for a number of years. This time however I ordered a bunch of regular 8x10" prints. When they arrived I put them all in a cello bag and on top of rigid 8x10" backing board and noticed that all the prints are a little smaller. When I measured them all the prints are 1/16 to almost 1/8 of an inch smaller in each dimension. Is this normal or should the prints be exactly 8x10"? I am worried that when people purchase 8x10" frames (which is why I decided to crop and print at this size) the prints will not fit.
Within production of paper based products such as photo prints, there are inaccuracies that are hard to avoid. If the prints are exposed on photo paper usually paper rolls are used which may already show these inaccuracies. Here you can find tolerances that are acceptable within an usual international paper size standard. I would guess, if your deviations are in the same range (about 1/10 in for comparable sizes) you have little arguments for a claim, but I would guess at least with local printers you could at least define some lower tolerances in advance.
There is even a bigger problem if the sizes are derived from a different unit system. In Germany we have a usual size of 10 cm x 15 cm, which may or may not be 4 in by 6 in, dependent on the manufacturer of the paper. In the latter case, it is a deviation of more than 2 mm on the longer side.
Usually the picture frames should be constructed with a bit smaller exposed area such that the border of the print is entirely hidden, but from my experience you can never be sure and have to measure in every single case. Disappointing.