i have the lee hand press just for the range .45-70 depriming, it works fine but is more time consuming and can be somewhat awkward to use as compared to a bench mounted press, even if the breech locks are used.  one of the cartridges i load is the .357mag and for the heckuvit i did a side-by-side comparison loading with the lee hand and bench presses - the bench press was more comfortable to use loading my weekly 100 rounds.  but, just my opinion and as always ymmv!   

   True. But, if you are light on space, the Lee Hand Press, a few sets of dies, some primers etc, fit into a shoe box. Some dedicated bench resters could take a little kit to the range, or a match. Sometimes, in a quest for super consistency, those guys might use one brass case for the day.

    I have one of those powder measures that uses replaceable bushings to measure the powder. The come with a list of how many grains of whatever powder they throw. I didn't trust the list, so I sat down with my powder scale and threw like 10 charges with each busing using every powder I used, and then averaged the result and wrote it all down.

    But I find hand loading a relaxing pass time.