As Mac said, I haven't had any shoot loose, and I have lots of em for it to happen on, I've got several hundred rounds thru my 45-120, with many hotter loads than the Leverevolution ammo, and even more rounds thru one of my .45-70 Handis, loads that are into Ruger data depending on who's data you look at! I also have about 250 rounds thru .338-06 A-Square Ultra and who knows how many rounds it saw before I got it as a .25-06!! I believe one contributing factor is no lube on the underlug pivot, just the opening and closing of the action will wear on the soft underlug, a little lubrication will go a long ways to preserving a tight action.
The problem is the underlug isn't solid, it's hollow. I'm working on a solution right now, but it's still in the theory stage. So far, I've removed the forward roll pin and drilled the hole out to .132" and put a .133" solid steel pin in it. Haven't decided what to do next for sure, it may get welded solid or just epoxy bedded with JB Stik and shimmed, dunno yet. I may also attempt to heat treat at least the end of the underlug then fit a piece of tool steel against the pin then fit a barrel. This is on the .300WSM donor barrel, so it's not a project for everyone, but if it works on it, it will work on any Handi!!!
Tim