How many lands & grooves do the standard .44 barrels have. Looks like these are Marlin micro groove barrels (says 12 groove). Then you have to get a barrel lug, turn barrel, ream the chamber, add forend lug, extractor/ejector, tap for scope base and/or sights and re-blue.
I would say, ordering a barrel fitted to you receiver would be a bargain when compared to this blank, unless you aren't looking to put in on a Handi.
I'm betting these barrels didn't perform and that is why they unloaded them. Just doesn't sound like the H&R I know.