There is one problem with the 1895 that I have fixed on mine. The screw at the end of the magazine tube was actually warping the tube there by putting downward pressure on the barrel.
I took a steel washer and thinned it down so it would just fit in the place at the end of the magazine tube. This relieved the pressure on the barrel and my groups shrunk to sub MOA at 100.
check your pressure at there.
By the way my 430 gr FP may by Mountain Molds is a verry stout load.