Now keep in mind you dont have to babe ruth the bastad
genital but firm taps will do the job, Rubber mallet is not a gunsmith's best friend because of the bounce by the way. Rawhide hammer, nylon hammer or a dead blow is what you really need.
Make sure the firearm is not in your lap but in a cradle or on the table, if the action "droops" away from the stock while you are trying to get it to set, you may be there a while. If you dont get it let us know and Ill make a video on how to do it with the factory walnut stock to give you an idea