That's a Pacific DL-155, or so close I can't tell the difference. A couple of things I can't tell from the picture - it
looks like the wad guide is in place but I can't be sure. If not, I don't know if you can get another one. The other thing is, I can't tell if you have a charge bar. Hope so.
Contact Hornady - they should have the documentation filed away somewhere. Their 366 press is the old Pacific DL-366 from around 1967 0r '68, just a few updates over the years.
If Hornady can't help, another thought. The basics of shotshell loading are pretty much the same whatever press you use. You might get some insight by going to the MEC Manuals page and downloading the manual for the discontinued version of the MEC 600jr. Won't give you set-up for your press, but as a general guide it might help some.
http://www.mecreloaders.com/OwnerManuals/OwnerManuals.aspI've asked on a couple other forums about a manual, but nobody's come up with one.
DC