Asa
Depends on your idea of portable, have seen
Saturday, May 02, 2020, 18:02

Hand held Lee Press or the simple hammer set

Full size clamped to kitchen table as well as mounted to a bar stool.

Podium style, with cabinet and high top, set on locking casters, can move around.

I have an 8ft×2ft work bench that if necessary I can fold and store behind a door.
Has been sturdy enough to size up to 30-06 holds a 4 inch vice and have built ARs on it, but I've also done the latter standing on the vice block and torquing on the floor(so we won't count that)

Lee (not sure of others) has quick change plates for mount one plate and can swap presses in and out.