I use the Lee system and actually set up with 3 seperate cutter heads ( it's just easier then swapping guides each time) and each of the 3 shanks are octagon.
Not sure how well that would work on a powder station? You'd hafta stop, mount the case then start again for each case.
I got the Zip Trim unit and it works slick. You can either mount it direct to the table or it has a hole in the side for a clamp, I use a long reach C-clamp that I modified on a grinder abit so the head would fit nice.
( I did have to sand the bottom of the housing to get it flat, it's plastic and the two halves didn't line up well on the bottom, a casting/molding issue, but there's plenty of material to work with )
I just pull it out an clamp it to my work table, trim-chamfer an deburr with a few pulls of the string and done. Then put it away, it's not taking up extra space. I like the Zip Trim because I can SEE that the case is indeed centered straight and spinning true before I apply the tools.
Another thing I really like about the Lee system is I don't have too mess with adjustment each time, the guide is set-up for sammi length for each cal and stops the cutting when it's the proper length, I do have my 223 set-up to trim .01 over sammi as both my 223's have really long chamber necks, it may not matter with that small amount but the point is you can modify the system to suit yer needs.
