I recently brought 1 of these back from Wisconsin (I'm originally from the Beloit area) to Vegas so my son can hunt the black powder muley season here. I am having problems geting this zeroed with the Irons (no scopes allowed here during BP season).

I am using the 240 gr hornady xtp sabot over 3 50 gr pyrodex pellets and musket caps. I cant get this thing to come down enough, I've run out of adjustment in the rear sight and I'm still 5 inches high at 25 yds. According to the load data available, this load should put me zero at 100 and +.7" at 50 yds. Don't really care for the fiber optic irons that it came with, but I'm kinda stuck with them. Is it possible that they shipped this with the wrong front blade height, I suppose stranger things have happened.

Any ideas?