Smith and Wesson says their Model 41s are tested with Green Tags, and my 41s do indeed function perfectly and group tightly.
One of my 41s didn't shoot nearly all other .22 ammo brands very reliably, however. I have since found some other ammo that works flawless and also groups very nicely as well. Eley Match and Eley Tenex (way more expensive than the Green Tag) and Federal Champion Target from Dicks (which lately has been nigh impossible to get for over a year). So naturally I bought ~30,000 rounds of the Champion Target over the last three years. ($13.99 to now $29.99 a brick to Impossible to find!)
I am down to about 5,000 rounds and will need to look for other ammo soon.