Congrats!! Those are likely old models with the 1:38" twist, kinda hard to find, the current model with the 1:20" twist is only available as a Handi unless H&R is sneaking some unadvertised models out like the thumbhole Ultras, or a distributor ordered some as special editions, ya never know any more!

I shot mine today with the 265gr Hornady and H4198 at 2165fps, got a one hole 3-shot group at 100yds.
Tim