I have a Dixie Gun Works 28 ga by the same maker. I paid $200 for it ten years ago. That was a bit high dollar but I wanted a light 28ga. But beware, it was marked as 28ga but it is not. It is 13.3mm or .526. A 28ga would be more like 13.9mm or .550. And there is the rub, I have seen three of these shotguns but only one was 13.9mm. So mic your gun or look on the barrel for the size before buying wads or cards. Other than different bore sizes, mine is my favorite BP long gun and a genuine fun gun. It weighs about 3 1/2 pounds. I use 3/4 to 1 ounce shot over 60 or 70 grains of whatever powder you bought. Most standard load listed calls for is 55grains and 3/4 ounce. Mine had this crappy dull orange finish. When I stripped the finish, I found it had dark wood under it. Finish on the barrel was good but the fit of metal to wood was just average. I use a homemade ramrod when at the range or woods because the flimsy rod it comes with is ok for occasional use but not for repeated use in the woods. I shoot prb out of mine at the range but would not hunt with it.
As far as the price goes, it is reasonable as long as the barrel is not thoroughly pitted.
BTW, Youtube has video of a guy shooting one. Just type 28 ga muzzleloader and it should come up.
Good luck and have fun.