Except for rebarreling or other internal repairs it is not necessary to dismount the stock.
If, however, it is required hold the rifle upside down by the forend and drop the butt into the other hand with some force. It may take several shots to free the barreled action. If the action is glued in a freezer may be needed.
In the 34 years that I have owned and fired my number 1 rifle it has been out of the stock only about 8 times. All for rebarreling or rebedding.