What kort said...
ALWAYS print from the largest size possible.  Also doing a test print might be a good idea as well so you know how they come out before you spend a load printing off your entire catalogue. You can also see how well your computer/screen is calibrated in terms of what comes out on paper and make adjustmensts accordingly.

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography