My .50 caliber Knight Wolverine has a 1-28 twist also. Since you did not mention the caliber I will guess it is .50 caliber. And yes, mine shoots roundball excellent. The trick is not to push them too hard. If you do they will skip the rifling. Start your loads out around 60 grains of powder is all. Dump your powder then load a lubed patch and .490 roundball for the .50 caliber. It will shock you at how well it shoots them. It sure did me. If it shoots them... fine. If it does not, well your not out anything. You can plink real good with them.

When your ready to step up to sabots, get some T/C mag express 240 grain XTP's and load 85 grains of Triple Se7en or Goex FFFg and then the sabot. Mine shoots them excellent. For hunting I shoot a 250 grain Barnes Express with 85 grains of powder and the accuracy is exceptional. I think I could push them harder, but with the 22" barrel it is all I felt I need to push them. This spring I am going to see how hard I can actually push them before the accuracy fails.

Good luck with your rifle.