I just used picrel to install a mercedes window regulator with 4.8 3/16 steel rivets. It was pretty maxed out, and I basically had to use the swivel head position where it's pointing away from the handles, and do a chest press to pop it.

But, steel 4.8 rivets are possible with a hand riveter. I wouldn't want to do more than a dozen or so and I don't know how many before the tool fails.