I couldn't find the Beeman Hunter 400 in Stu's Calculator. So I used the "generic" carbon 400 size.
If your bow is 47#@28" it will likely be 50#@29". If the window is cut 1/8" past centershot. And if you use a B50 (dacron rather than Fast Flight) string.
If you cut your arrow at 30" (inch longer than draw-min.)If you have 3, 5" feathers, a 9 grain nock, 20 grain inssert and a 150 grain broadhead.
Stu's Calculator says the 400 should be very good for you. The arrow will weigh 486 grains.
Like others have said, the 400 is pretty stiff for a 50# draw weight. That's why you have to put a 150 grain broadhead on it but that's not a heavy head for a lot of people.
If your bow is cut more or less past centershot or if your bow is suited for FF and you use FF string, that will also affect this set-up.
Personally, I'd buy other things you need (field tips, broadheads, glove, armguard, silencers, bow case, bow quiver, etc. all of which can be done at Bass Pro (but not very well).Then I'd buy Beman MFX Classics for a heavier arrow and more traditional look. Of course there are many trad arrow providers who sponsor this site.
You've already found the fine folks at Bass Pro probably don't know that Traditional is supposed to be capitalized and spoken reverantly!
Good luck!