H&R dropped the sights on several barrels, they only offer slick barrels in those chamberings, the 357mag and 44mag both only come with scope rails and on SB1 frames, it's been that way since early 2008, they'll also fit those two accessory barrels to your 1987 or later SB1 frame.
Sure Dave, many, many here have done theirs to max themselves, I just did my second one yesterday, piece of cake, takes about 15 minutes IF you take your time and clean the chips out frequently, there's a link in the FAQs on how to, reamer can be rented for less than $50 including shipping it back, or you can buy a reamer as Larry suggested, then sell it.

Tim