As others have mentioned, it appears in the pictures that the grain that would be from the action to the grip might not be ideal for a Win 1885. Maybe better pictures of that area will give us a better idea. However, since the 1885 does not have a stock thru bolt to the action, there is no support.

I've stocked several original 1885's in very fancy wood but had good grain thru this area. Wood without good grain thru the grip can, however, be used successfully on rifles like the No. 1, Ballards, and Winchester model 12's etc. since they have a draw bolt and provide needed support.
Phil