UltraMag are stainless, .504only,have a 26" barrel, wear a small Sportsman's Warehouse logo on the barrel, and come with #11, musket, and 209 ignitions. They were supposed to have included a 209 bolt and a cap bolt but some do, some don't. You can get an UltraMag new for 299.xx at the Sportsman's Warehouse in Phoenix, Az or Aurora, Co.(last I knew) The synthetic stock on the UltraMags is quite nice and was made especially for that model.

UltraMag http://www.whitemuzzleloading.com/M97UltraMagFullRight.jpg <-- pic is big (from Doc's website)

The standard Whitetail is shown below (from WhiteRifles website)
Whitetail has a 22" barrel, laminated stock, one ramrod thimble, one ignition. Same action, same trigger on both.