Well back from shooting. At 50 yards there was a single hole group from the weights I was given. Though at 100 yards the "groups" were like a shotgun pattern. Again I went back to the Fx 25.4 pellets and did a single hole group at 50 yards and a ragged hole at 100 yards.
After talking with Tom about the first testing the barrels are ment for pellets for sure. With a twist of 1:18 so nothing close to what a slug needs. There is always the possibility of finding something that will work, but it will be a custom made slug.
I am going to be using this gun, with the pellets, on Sunday for an NRL22 match. May have some video of the stages and will report back for sure.