I just put one together two weeks ago. Shot it for the first time on Sunday and am impressed.
Using 95 gr. Sierra SMK's loaded at 0.010 off the lands and a mid point load of IMR 4895 give or take half a gr. it kept a .5 or a little better outside to outside at 100 yards with little to no recoil.
Built on a model 12 single shot sitting in a McMillan Edge stock. it is a X Caliber 1:8 twist, full cylinder barrel from Apache, built for short range BR.
Going to load some with a load in the middle of what I was using to get rid of the vertical and a few thousandths deeper for the slight horizontal.
I will post the results.