Here is the update that I promised to post.
Shot my CVA Frontier 50 cal. rifle loaded with 50 gr, 60 gr & 70 gr of Allient MZ powder. Loaded a fiber wad, followed up with a "Real' 250 gr bullet. Fired 5 shots on each charge. Target was at 75 yds. Only one bullet hit the target. Don't know where the rest of them went.
I then brought out my CVA Elite Stalker inline rifle. Repeated the loads and fired at 75 yds.
Below is a group that I finally got after a lot of shooting and adjusting scope.
Never had to swab the bores on either gun the whole time I was shooting. This powder has a strong smell to the smoke after shooting. Plus it didn't pour into powder measure as easy as regular black powder does.
I will repeat the shooting of the "Real" bullets in my inline to see if they stay the same.