A 420gr plain base shows 28.5 of IMR4198 as starting load for an 1895 for 1267fps and 41.5 as a max load for 1737.
The data for a Ruger #1 which is too heavy for your 1895 shows a gas checked 426 grain with a starting load of 40 grains of IMR 4198 at 1741fps and a max of 46.3 grains for 1954fps (39,200 CUP)
It also shows (for Ruger #1) a gas checked 451 grain and an IMR 4198 load of 33 grains starting for 1445 fps and a max load of 43 grains for 1883 fps (38,400 CUP) which are rated too high for your 1895.
FWIW.